Made a copy of errors with the AC_TRY_RUN() macro...appears to work better
under FreeBSD for DBL_MIN check now...

src/configure.in

@@ -509,10 +509,13 @@ AC_TRY_LINK([#include <sys/types.h>
 	    [AC_DEFINE(HAVE_UNION_SEMUN) AC_MSG_RESULT(yes)],
 	    AC_MSG_RESULT(no))
 
-AC_MSG_CHECKING(DBL_MIN good)
-AC_TRY_RUN([#include <math.h>
-main()
-{ double d = DBL_MIN; if (d != DBL_MIN) exit -1; else exit 0; }],
+AC_MSG_CHECKING(for good DBL_MIN)
+AC_TRY_RUN([#include <stdlib.h>
+#include <math.h>
+#ifdef HAVE_FLOAT_H
+# include <float.h>
+#endif
+main() { double d = DBL_MIN; if (d != DBL_MIN) exit(-1); else exit(0); }],
 	AC_MSG_RESULT(yes),
 	[AC_MSG_RESULT(no) AC_DEFINE(HAVE_DBL_MIN_PROBLEM)])