Nokogiri: gem install nokogiri -v 1.6.8 fails on alpine linux

[GeorgePhillips]

Nokogiri fails to install on alpine linux. Can be testing using the DockerFile below:

FROM alpine:3.4

RUN apk upgrade --update \
    && apk add libatomic readline readline-dev \
        libxml2 libxml2-dev libxml2-utils \
        ncurses-terminfo-base ncurses-terminfo \
        libxslt libxslt-dev zlib-dev zlib ruby yaml \
        yaml-dev libffi-dev build-base git nodejs \
        ruby-io-console ruby-irb ruby-json ruby-rake \
        imagemagick imagemagick-dev make \
        gcc g++ libffi-dev ruby-dev \
    && apk add --no-cache python py-pygments \
    && python -m ensurepip \
    && rm -r /usr/lib/python*/ensurepip \
    && pip install --upgrade pip setuptools \
    && apk add py-pygments

RUN gem install --no-document nokogiri -v 1.6.8 -- --use-system-libraries

Which produces the following output:

Successfully installed pkg-config-1.1.7
Successfully installed mini_portile2-2.1.0
Building native extensions with: '--use-system-libraries'
This could take a while...
ERROR:  Error installing nokogiri:
    ERROR: Failed to build gem native extension.

    current directory: /usr/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8/ext/nokogiri
/usr/bin/ruby -r ./siteconf20160613-8-jiwea2.rb extconf.rb --use-system-libraries
Using pkg-config version 1.1.7
checking if the C compiler accepts ... yes
Building nokogiri using system libraries.
checking for libexslt... yes
checking for xmlParseDoc() in libxml/parser.h... no
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
-----
libxml2 is missing.  Please locate mkmf.log to investigate how it is failing.
-----
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/usr/bin/$(RUBY_BASE_NAME)
    --help
    --clean
    --use-system-libraries
    --with-zlib-dir
    --without-zlib-dir
    --with-zlib-include
    --without-zlib-include=${zlib-dir}/include
    --with-zlib-lib
    --without-zlib-lib=${zlib-dir}/lib
    --with-xml2-dir
    --without-xml2-dir
    --with-xml2-include
    --without-xml2-include=${xml2-dir}/include
    --with-xml2-lib
    --without-xml2-lib=${xml2-dir}/lib
    --with-libxml-2.0-config
    --without-libxml-2.0-config
    --with-pkg-config
    --without-pkg-config
    --with-xslt-dir
    --without-xslt-dir
    --with-xslt-include
    --without-xslt-include=${xslt-dir}/include
    --with-xslt-lib
    --without-xslt-lib=${xslt-dir}/lib
    --with-libxslt-config
    --without-libxslt-config
    --with-exslt-dir
    --without-exslt-dir
    --with-exslt-include
    --without-exslt-include=${exslt-dir}/include
    --with-exslt-lib
    --without-exslt-lib=${exslt-dir}/lib
    --with-libexslt-config
    --without-libexslt-config
    --with-pkg-config
    --without-pkg-config
    --with-override-variables
    --without-override-variables
    --with-xml2lib
    --without-xml2lib
    --with-libxml2lib
    --without-libxml2lib

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /usr/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0/nokogiri-1.6.8/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8 for inspection.
Results logged to /usr/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0/nokogiri-1.6.8/gem_make.out
The command '/bin/sh -c gem install --no-document nokogiri -v 1.6.8 -- --use-system-libraries' returned a non-zero code: 1

Installing nokogiri -v 1.6.7 works fine

[chrisvel]

This worked for me.

gem install nokogiri -- --use-system-libraries --with-xml2-config=/usr/local/bin/xml2-config --with-xslt-config=/usr/local/bin/xslt-config

It's sad that latest changes don't seem to have been tested before pushing to the current "stable" version and appears that lots of people have the same issue.

[GeorgePhillips]

Thanks for the response. I get the same issue unfortunately.

FROM alpine:3.4

RUN apk upgrade --update \
    && apk add libatomic readline readline-dev \
        libxml2 libxml2-dev libxml2-utils \
        ncurses-terminfo-base ncurses-terminfo \
        libxslt libxslt-dev zlib-dev zlib ruby yaml \
        yaml-dev libffi-dev build-base git nodejs \
        ruby-io-console ruby-irb ruby-json ruby-rake \
        imagemagick imagemagick-dev make \
        gcc g++ libffi-dev ruby-dev \
    && apk add --no-cache python py-pygments \
    && python -m ensurepip \
    && rm -r /usr/lib/python*/ensurepip \
    && pip install --upgrade pip setuptools \
    && apk add py-pygments

RUN gem install nokogiri -- --use-system-libraries --with-xml2-config=/usr/local/bin/xml2-config --with-xslt-config=/usr/local/bin/xslt-config

This gives:

Successfully installed mini_portile2-2.1.0
Successfully installed pkg-config-1.1.7
Building native extensions with: '--use-system-libraries --with-xml2-config=/usr/local/bin/xml2-config --with-xslt-config=/usr/local/bin/xslt-config'
This could take a while...
ERROR:  Error installing nokogiri:
    ERROR: Failed to build gem native extension.

    current directory: /usr/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8/ext/nokogiri
/usr/bin/ruby -r ./siteconf20160620-9-iy57no.rb extconf.rb --use-system-libraries --with-xml2-config=/usr/local/bin/xml2-config --with-xslt-config=/usr/local/bin/xslt-config
Using pkg-config version 1.1.7
checking if the C compiler accepts ... yes
Building nokogiri using system libraries.
checking for libexslt... yes
checking for xmlParseDoc() in libxml/parser.h... no
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
-----
libxml2 is missing.  Please locate mkmf.log to investigate how it is failing.
-----
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/usr/bin/$(RUBY_BASE_NAME)
    --help
    --clean
    --use-system-libraries
    --with-zlib-dir
    --without-zlib-dir
    --with-zlib-include
    --without-zlib-include=${zlib-dir}/include
    --with-zlib-lib
    --without-zlib-lib=${zlib-dir}/lib
    --with-xml2-dir
    --without-xml2-dir
    --with-xml2-include
    --without-xml2-include=${xml2-dir}/include
    --with-xml2-lib
    --without-xml2-lib=${xml2-dir}/lib
    --with-libxml-2.0-config
    --without-libxml-2.0-config
    --with-pkg-config
    --without-pkg-config
    --with-xslt-dir
    --without-xslt-dir
    --with-xslt-include
    --without-xslt-include=${xslt-dir}/include
    --with-xslt-lib
    --without-xslt-lib=${xslt-dir}/lib
    --with-libxslt-config
    --without-libxslt-config
    --with-exslt-dir
    --without-exslt-dir
    --with-exslt-include
    --without-exslt-include=${exslt-dir}/include
    --with-exslt-lib
    --without-exslt-lib=${exslt-dir}/lib
    --with-libexslt-config
    --without-libexslt-config
    --with-pkg-config
    --without-pkg-config
    --with-override-variables
    --without-override-variables
    --with-xml2lib
    --without-xml2lib
    --with-libxml2lib
    --without-libxml2lib

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /usr/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0/nokogiri-1.6.8/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8 for inspection.
Results logged to /usr/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0/nokogiri-1.6.8/gem_make.out
The command '/bin/sh -c gem install nokogiri -- --use-system-libraries --with-xml2-config=/usr/local/bin/xml2-config --with-xslt-config=/usr/local/bin/xslt-config' returned a non-zero code: 1

[chrisvel]

Says libxml2 is missing so try installing it first.

[flavorjones]

@GeorgePhillips can you please provide your mkmf.log file from both attempts, with and without --use-system-libraries?

[GeorgePhillips]

With --use-system-libraries:

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby  -lpthread -lgmp -ldl -lcrypt -lm   -lc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"gcc -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC    -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */

| pkg-config --libs libxml-2.0
=> "-lxml2  \n"
"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby -lxml2 -lpthread -lgmp -ldl -lcrypt -lm   -lc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

| pkg-config --cflags-only-I libxml-2.0
=> "-I/usr/include/libxml2  \n"
| pkg-config --cflags-only-other libxml-2.0
=> " \n"
| pkg-config --libs-only-l libxml-2.0
=> "-lxml2  \n"
package configuration for libxml-2.0
cflags:
ldflags:
libs: -lxml2

| pkg-config --libs libxslt
=> "-lxslt -lz -lm  -lxml2  \n"
"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline  conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic      -lxml2 -lruby -lxslt -lz -lm  -lxml2 -lpthread -lgmp -ldl -lcrypt -lm   -lc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

| pkg-config --cflags-only-I libxslt
=> "-I/usr/include/libxml2  \n"
| pkg-config --cflags-only-other libxslt
=> " \n"
| pkg-config --libs-only-l libxslt
=> "-lxslt -lz -lm -lxml2  \n"
package configuration for libxslt
cflags:
ldflags:
libs: -lxslt -lz -lm -lxml2

| pkg-config --libs libexslt
=> "-lexslt -lxslt -lz -lm  -lgcrypt -lgpg-error -lxml2  \n"
"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic       -lxml2 -lxslt -lz -lm -lxml2 -lruby -lexslt -lxslt -lz -lm  -lgcrypt -lgpg-error -lxml2 -lpthread -lgmp -ldl -lcrypt -lm   -lc "
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

package configuration for libexslt is not found
have_package: checking for libexslt... -------------------- yes

--------------------

PKGConfig package configuration for libexslt
cflags: -I/usr/include/libxml2
ldflags:
libs: -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error

"gcc -E -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <libxml/xmlversion.h>
/* end */

"gcc -E -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <libxml/xmlversion.h>
4: #if LIBXML_VERSION < 20621
5: #error libxml2 is older than 2.6.21
6: #endif
/* end */

"gcc -E -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <libxml/xmlversion.h>
4: #if LIBXML_VERSION < 20903
5: #error libxml2 is older than 2.9.3
6: #endif
/* end */

have_func: checking for xmlParseDoc() in libxml/parser.h... -------------------- no

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: int t(void) { void ((*volatile p)()); p = (void ((*)()))xmlParseDoc; return !p; }
/* end */

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
conftest.c:15:13: error: conflicting types for 'xmlParseDoc'
 extern void xmlParseDoc();
             ^
In file included from conftest.c:3:0:
/usr/include/libxml2/libxml/parser.h:842:3: note: previous declaration of 'xmlParseDoc' was here
   xmlParseDoc  (const xmlChar *cur);
   ^
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: extern void xmlParseDoc();
16: int t(void) { xmlParseDoc(); return 0; }
/* end */

--------------------

have_library: checking for xmlParseDoc() in -lxml2... -------------------- no

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby -lxml2  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: int t(void) { void ((*volatile p)()); p = (void ((*)()))xmlParseDoc; return !p; }
/* end */

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby -lxml2  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
conftest.c:15:13: error: conflicting types for 'xmlParseDoc'
 extern void xmlParseDoc();
             ^
In file included from conftest.c:3:0:
/usr/include/libxml2/libxml/parser.h:842:3: note: previous declaration of 'xmlParseDoc' was here
   xmlParseDoc  (const xmlChar *cur);
   ^
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: extern void xmlParseDoc();
16: int t(void) { xmlParseDoc(); return 0; }
/* end */

--------------------

have_library: checking for xmlParseDoc() in -llibxml2... -------------------- no

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby -llibxml2  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -llibxml2
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgcrypt
/usr/lib/gcc/x86_64-alpine-linux-musl/5.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lgpg-error
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: int t(void) { void ((*volatile p)()); p = (void ((*)()))xmlParseDoc; return !p; }
/* end */

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux-musl -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -I/usr/include/libxml2 -I/usr/include/libxml2 -Os -fomit-frame-pointer   -Os -fomit-frame-pointer -fno-omit-frame-pointer -fno-strict-aliasing -fPIC  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline   -I/usr/include/libxml2 conftest.c  -L. -L/usr/lib -L. -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic        -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lruby -llibxml2  -lxml2 -lxslt -lz -lm -lxml2 -lexslt -lxslt -lxml2 -lz -lm -lgcrypt -lgpg-error -lpthread -lgmp -ldl -lcrypt -lm   -lc "
conftest.c:15:13: error: conflicting types for 'xmlParseDoc'
 extern void xmlParseDoc();
             ^
In file included from conftest.c:3:0:
/usr/include/libxml2/libxml/parser.h:842:3: note: previous declaration of 'xmlParseDoc' was here
   xmlParseDoc  (const xmlChar *cur);
   ^
checked program was:
/* begin */
 1: #include "ruby.h"
 2:
 3: #include <libxml/parser.h>
 4:
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12:
13:   return 0;
14: }
15: extern void xmlParseDoc();
16: int t(void) { xmlParseDoc(); return 0; }
/* end */

[GeorgePhillips]

Running it without -- --use-system-libraries works:

FROM alpine:3.4

RUN apk upgrade --update \
    && apk add libatomic readline readline-dev \
        libxml2 libxml2-dev libxml2-utils \
        ncurses-terminfo-base ncurses-terminfo \
        libxslt libxslt-dev zlib-dev zlib ruby yaml \
        yaml-dev libffi-dev build-base git nodejs \
        ruby-io-console ruby-irb ruby-json ruby-rake \
        imagemagick imagemagick-dev make \
        gcc g++ libffi-dev ruby-dev \
    && apk add --no-cache python py-pygments \
    && python -m ensurepip \
    && rm -r /usr/lib/python*/ensurepip \
    && pip install --upgrade pip setuptools \
    && apk add py-pygments

RUN gem install --no-document nokogiri -v 1.6.8

[sandesh-TheAwakening]

Running it without -- --use-system-libraries works:

Even worked for me.

[flah00]

It seems like the error is a misleading, further up the linker barfs, because gcrypt libraries are missing. Once I installed libgcrypt-dev, things worked

apk add libgcrypt-dev
gem install nokogiri --no-document -- --use-system-libraries
Building native extensions with: '--use-system-libraries'
This could take a while...
Successfully installed nokogiri-1.6.8
1 gem installed

[flavorjones]

I'd like very much if someone who cares about Alpine Linux support would send a PR to the installation tutorial:

https://github.com/sparklemotion/nokogiri.org-tutorials/pulls

[dlibanori]

You have to see this:
https://bartelwedding.com/notes/2016-04-15-nokogiri-on-alpine.html

[flavorjones]

@dlibanori Thanks for the link. Though, please see my previous comment from Oct 2. You took the time to comment here; perhaps you could take a few more minutes to send a PR to the tutorials repo?

[GeorgePhillips]

Just testing the code and will do a PR if it works

[mkagenius]

Note: Just install any version of nokogiri and point to that version in Gemfile.lock