mkvtoolnix/ac/magic.m4

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dnl
dnl Check for libmagic
dnl
magic_mingw_libs=""
if test "x$ac_cv_mingw32" = "xyes"; then
magic_mingw_libs="-lshlwapi"
fi
AC_CHECK_LIB(magic, magic_open, [ magic_found=yes ], [ magic_found=no ], [-lz $GNURX_LIBS $magic_mingw_libs])
if test "x$magic_found" = "xyes" ; then
AC_CHECK_HEADERS([magic.h])
if test "x$ac_cv_header_magic_h" = "xyes" ; then
MAGIC_LIBS="-lmagic -lz $GNURX_LIBS $magic_mingw_libs"
opt_features_yes="$opt_features_yes\n * libMagic file type detection"
else
opt_features_no="$opt_features_no\n * libMagic file type detection"
fi
else
opt_features_no="$opt_features_no\n * libMagic file type detection"
fi
AC_SUBST(MAGIC_LIBS)