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How to continue the gem installation process

I am trying to install phashion which should compile the pHash library. pHash depends on libjpeg. Gem installs fine on Linux boxes, but I have some problems on my Mac (Lion 10.7.3):

I installed libjpeg via MacPorts, but when I started gem install phashion, the process failed, complaining about missing libjpeg.

This is the error I get:

gcc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -I/Library/Ruby/Gems/1.8/gems/phashion-1.0.4/ext/phashion_ext/include  -L/Library/Ruby/Gems/1.8/gems/phashion-1.0.4/ext/phashion_ext/lib  -x c++   -c phashion_ext.c
cc -arch i386 -arch x86_64 -pipe -bundle -undefined dynamic_lookup -o phashion_ext.bundle phashion_ext.o -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L/Library/Ruby/Gems/1.8/gems/phashion-1.0.4/ext/phashion_ext/lib -L/Library/Ruby/Gems/1.8/gems/phashion-1.0.4/ext/phashion_ext/lib -L. -arch i386 -arch x86_64     -lruby   -lpthread -lpHash_gem -lstdc++ -ljpeg
ld: library not found for -ljpeg
collect2: ld returned 1 exit status
ld: library not found for -ljpeg
collect2: ld returned 1 exit status
lipo: can't open input file: /var/tmp//ccCwUAM1.out (No such file or directory)
make: *** [phashion_ext.bundle] Error 1


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/phashion-1.0.4 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/phashion-1.0.4/ext/phashion_ext/gem_make.out

libjpeg lies in /opt/local/lib. So I looked at the gem make file and added the library path to ldflags. Now make works fine, and the library seems to be compiling.

Now what? When I run again gem install phashion, my makefile is overwritten.

So, how can I start the installation process again without losing my changes in the stone?

PS: gem rake, :

WARNING: rake-compiler found compiled files in 'ext/phashion_ext' directory. Please remove them.
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -I"lib:lib:test" -I"/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib" "/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb" "test/**/test_*.rb" 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:29:in `gem_original_require': no such file to load -- phashion_ext (LoadError)
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:29:in `require'
    from ./lib/phashion.rb:33
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:29:in `require'
    from ./test/helper.rb:3
    from /Library/Ruby/Gems/1.8/gems/phashion-1.0.4/test/test_phashion.rb:1:in `require'
    from /Library/Ruby/Gems/1.8/gems/phashion-1.0.4/test/test_phashion.rb:1
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10:in `require'
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9:in `each'
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4:in `select'
    from /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4
rake aborted!
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