Fix cross building by using test -f instead of AC_CHECK_FILE #14
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From Debian bug #929037 [1], reported by Helmut Grohne helmut@subdivi.de:
mathicgb fails to cross build from source, because it abuses
AC_CHECK_FILE to discover source files on the build machine. The macro
is meant to check for files on the host. Please use simple "test -f"
here. The attached patch makes mathicgb cross buildable. Please consider
applying it.
Helmut
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929037