Use PKG_CHECK_MODULES instead of AC_CHECK_LIB for libmagic #66
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As requested in https://listman.redhat.com/archives/libguestfs/2021-May/msg00011.html.
With this change it is possible to get libmagic discovered from a non-standard prefix using e.g.
LIBMAGIC_LIBS="~/.local/lib64" LIBMAGIC_CFLAGS="-O3"(there may also be a way usingPKG_CONFIG_PATHthat I'm not aware of).Without this change discovery can be achieved with
LDFLAGS="-L ~/.local/lib64".Note the
magic.hheader file also needs to be discoverable, which I achieved usingCPPFLAGS="-I ~/.local/include".