Failed to build gem native extension

If you have El Capitan and you get this issue:

Installing eventmachine 1.0.8 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

/usr/local/var/rbenv/versions/2.1.7/bin/ruby extconf.rb
checking for rb_trap_immediate in ruby.h,rubysig.h... no  
checking for rb_thread_blocking_region()... yes  
checking for ruby/thread.h... yes  
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes  
checking for inotify_init() in sys/inotify.h... no  
checking for __NR_inotify_init in sys/syscall.h... no  
checking for writev() in sys/uio.h... yes  
checking for rb_thread_fd_select()... yes  
checking for rb_fdset_t in ruby/intern.h... yes  
checking for pipe2() in unistd.h... no  
checking for accept4() in sys/socket.h... no  
checking for SOCK_CLOEXEC in sys/socket.h... no  
checking for rb_wait_for_single_fd()... yes  
checking for rb_enable_interrupt()... no  
checking for rb_time_new()... yes  
checking for sys/event.h... yes  
checking for sys/queue.h... yes  
CFLAGS= -O3 -Wno-error=shorten-64-to-32  -pipe  -Wall -Wextra -Wno-deprecated-declarations -Wno-ignored-qualifiers -Wno-unused-result  
CPPFLAGS=-I/usr/local/var/rbenv/versions/2.1.7/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT $(DEFS) $(cppflags) -Wall -Wextra -Wno-deprecated-declarations -Wno-ignored-qualifiers -Wno-unused-result  
checking for clock_gettime()... no  
checking for gethrtime()... no  
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="  
compiling binder.cpp  
In file included from binder.cpp:20:  
./project.h:116:10: fatal error: 'openssl/ssl.h' file not found
#include <openssl/ssl.h>
1 error generated.  
make: *** [binder.o] Error 1

make failed, exit code 2

El Capitan no longer provides OpenSSL headers. You'll need to install openssl using either HomeBrew or MacPorts.

Try with brew link openssl --force

Victor Velazquez

Coder, Musician, Startups, Passionate Dancer & Life Lover. Director of Engineering at MagmaLabs, Co-founder of Web Dev Talks, Co-founder of Voltaire, Co-founder of Paqkit, Ex-co-founder of Zaznova.

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