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@@ -755,7 +755,24 @@ CPPFLAGS_SAVED=$CPPFLAGS
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CPPFLAGS="$BOTAN_INCLUDES $CPPFLAGS"
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LIBS_SAVED="$LIBS"
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LIBS="$LIBS $BOTAN_LIBS"
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-AC_CHECK_HEADERS([botan/botan.h],,AC_MSG_ERROR([Missing required header files.]))
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+
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+# ac_header_preproc is an autoconf symbol (undocumented but stable) that
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+# is set if the pre-processor phase passes. Thus by adding a custom
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+# failure handler we can detect the difference between a header not existing
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+# (or not even passing the pre-processor phase) and a header file resulting
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+# in compilation failures.
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+AC_CHECK_HEADERS([botan/botan.h],,[
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+ if test "x$ac_header_preproc" = "xyes"; then
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+ AC_MSG_ERROR([
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+botan/botan.h was found but is unusable. The most common cause of this problem
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+is attempting to use an updated C++ compiler with older C++ libraries, such as
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+the version of Botan that comes with your distribution. If you have updated
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+your C++ compiler we highly recommend that you use support libraries such as
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+Boost and Botan that were compiled with the same compiler version.])
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+ else
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+ AC_MSG_ERROR([Missing required header files.])
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+ fi]
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+)
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM([#include <botan/botan.h>
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#include <botan/hash.h>
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Kean Johnston