Take the 2-minute tour ×  I am trying to install a program that
requires the libmad (MPEG audio decoder library) library on Mac
OS X 10.7 Lion, but installing libmad.0.15.b results in this
error:   That library installs fine on OS X 10.5. Is it a 64-bit
compatibility issue? I can't find any specific instructions or
documents regarding installing on Lion. Any suggestions? Thanks.
share|improve this question add comment  2 Answers  up vote 8
down vote accepted  By default, the C and C++ compilers on Snow
Leopard and newer generate 64-bit binaries, not 32-bit as in
older versions of OS X. The libmad configure script apparently
hasn't been changed to cope with this, and so generates build
commands that cause the 32/64 bit conflict you see.  That means
one way to fix it is to force a 32-bit build.  But, it's easy
enough to clue the configure script into the correct CPU type.
For Lion:  $ ./configure x86_64-apple-darwin11.3.0  For Snow
Leopard, change the kernel version:  $ ./configure x86_64-apple-
darwin10.6.0 sh