错误：无法构建 gem 本机扩展。 M1 芯片未找到potracelib.h

Question

I'm trying to install a Rails 5 app in my Macbook Air with M1 chip. This app is using a gem called potracer .

After doing $ bundle install I get the error:

Installing potracer 1.1.4 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/user/.rvm/gems/ruby-2.7.2/gems/potracer-1.1.4/ext/potracer
/Users/user/.rvm/rubies/ruby-2.7.2/bin/ruby -I /Users/user/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0 -r ./siteconf20211025-1533-nnxnj9.rb extconf.rb
checking for potracelib.h... no
potracelib.h not found
*** 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
    --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=/Users/user/.rvm/rubies/ruby-2.7.2/bin/$(RUBY_BASE_NAME)
    --with-potrace-dir
    --without-potrace-dir
    --with-potrace-include
    --without-potrace-include=${potrace-dir}/include
    --with-potrace-lib
    --without-potrace-lib=${potrace-dir}/lib

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

  /Users/user/.rvm/gems/ruby-2.7.2/extensions/arm64-darwin-20/2.7.0/potracer-1.1.4/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/user/.rvm/gems/ruby-2.7.2/gems/potracer-1.1.4 for inspection.
Results logged to /Users/user/.rvm/gems/ruby-2.7.2/extensions/arm64-darwin-20/2.7.0/potracer-1.1.4/gem_make.out

An error occurred while installing potracer (1.1.4), and Bundler cannot continue.
Make sure that `gem install potracer -v '1.1.4' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  potracer

I had other issues installing other rails app with the M1 chip but I found workarounds but not in this case.

Ideas on how to solved this?

Answer 1

I am not an potrace expert but I thing you have to reinstall potrace loccaly before. The installation seems to be incomplete. Not linked to your chip.

The potrace execution will abort unless you get the potrace.h locally

abort potracelib.h not found' unless find_header('potracelib.h')

    require 'mkmf'

RbConfig::MAKEFILE_CONFIG['CC'] = ENV['CC'] if ENV['CC']

LIBDIR = RbConfig::CONFIG['libdir']
INCLUDEDIR = RbConfig::CONFIG['includedir']

HEADER_DIRS = ['/opt/local/include', '/usr/local/include', INCLUDEDIR,
               '/usr/include']

LIB_DIRS = ['/opt/local/lib', '/usr/local/lib', LIBDIR, '/usr/lib']

dir_config('potrace', HEADER_DIRS, LIB_DIRS)

abort 'potracelib.h not found' unless find_header('potracelib.h')
abort 'lib potrace not found' unless find_library('potrace', 'potrace_version')

create_header
create_makefile('potracer/potracer')

Source: https://github.com/kennyp/potracer/blob/b67d3ff6a1ae672ccc6701fa5245fa532b461ef3/ext/potracer/extconf.rb