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Editorial Team
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Asked: 2026-05-26T09:17:50+00:00

I’d like to compile a fortran code with gfortran so that it will work

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I’d like to compile a fortran code with gfortran so that it will work on both Mac OS X 10.5 and 10.6. Is there a way to do this? I tried compiling on 10.6 and get this message when I run the executable on 10.5:

dyld: unknown required load command 0x80000022
Trace/BPT trap

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1 Answer

  1. Editorial Team

    The application was incorrectly built on OS X 10.6 machine for a 10.5 machine. The developer can fix this by considering three things:

    Using the correct compiler parameters:
gcc-4.2 -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk ...

Using the correct linker settings (setting environment variable before link command). This is required, so that the OS X 10.6 linker will not use the loader command 'LC_DYLD_INFO_ONLY' (=0x80000022), because OS X 10.5 does not understand this command:

export MACOSX_DEPLOYMENT_TARGET=10.5
(or   setenv MACOSX_DEPLOYMENT_TARGET=10.5)

    After this is fixed, one can check if the application was correctly built for OS X 10.5 by running ‘otool’:

    otool -l binary

    The correct binary should not contain any ‘LC_DYLD_INFO_ONLY’ load commands (only ‘LC_DYLD_INFO’ commands).

    (also see my blog article http://grauonline.de/wordpress/?p=71 )

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