new file mode 100755
--- /dev/null
+++ b/f2c-compat.sh
@@ -0,0 +1,120 @@
+#!/bin/sh
+#
+# f2c-compat -- try to see if calling a Fortran compiled routine from
+# a C compiled main program will work as if the Fortran routine has
+# been translated to C via f2c.
+#
+# John W. Eaton
+# jwe@che.utexas.edu
+# Department of Chemical Engineering
+# The University of Texas at Austin
+
+# trap 'rm -f ftest* ctest* core; exit 1' 1 3 15
+
+status=1
+
+if test $# -eq 0; then
+  FLIBS_SH="./flibs.sh"
+elif test $# -eq 1; then
+  FLIBS_SH="$1"
+else
+  echo "usage: f2c-compat.sh [flibs_script]"
+  exit 1
+fi
+
+# Write a minimal program, compile it, and see if it works as
+# expected.
+
+cat << EOF > ftest.f
+      INTEGER FUNCTION FORSUB (C, D)
+      CHARACTER *(*) C
+      INTEGER L
+      DOUBLE PRECISION D
+      L = LEN (C)
+      WRITE (*, '(A,1X,I2)') C(1:L), INT (D)
+      FORSUB = 1
+      RETURN
+      END
+EOF
+${F77-f77} -c ftest.f > /dev/null 2>&1
+
+cat << EOF > ctest.c
+extern int strlen ();
+extern int strcpy ();
+extern int forsub_ ();
+static char s[14];
+int
+main (argc, argv)
+  int argc;
+  char **argv;
+{
+  double d = 10.0;
+  int len;
+  strcpy (s, "FOO-I-HITHERE");
+  len = strlen (s);
+  return (! forsub_ (s, &d, len));
+}
+/* For Sun f77 */
+int
+MAIN_ ()
+{
+  return 0;
+}
+EOF
+
+${CC-cc} -c ctest.c > /dev/null 2>&1
+
+FLIBS=`F77="${F77-f77}" $FLIBS_SH`
+
+${CC-cc} -o ctest ctest.o ftest.o $FLIBS -lm > /dev/null 2>&1
+
+ctest_output=`./ctest 2>&1`
+status=$?
+
+if test $status -eq 0 && test "$ctest_output" = "FOO-I-HITHERE 10"
+then
+  echo '-DF77_APPEND_UNDERSCORE=1'
+  status=0
+else
+  cat << EOF > ctest.c
+extern int strlen ();
+extern int strcpy ();
+extern int forsub ();
+static char s[14];
+int
+main (argc, argv)
+  int argc;
+  char **argv;
+{
+  double d = 10.0;
+  int len;
+  strcpy (s, "FOO-I-HITHERE");
+  len = strlen (s);
+  return (! forsub (s, &d, len));
+}
+/* For Sun f77 */
+int
+MAIN_ ()
+{
+  return 0;
+}
+EOF
+
+  ${CC-cc} -c ctest.c > /dev/null 2>&1
+
+  ${CC-cc} -o ctest ctest.o ftest.o $FLIBS -lm > /dev/null 2>&1
+
+  ctest_output=`./ctest 2>&1`
+  status=$?
+
+  if test $status -eq 0 && test "$ctest_output" = "FOO-I-HITHERE 10"
+  then
+    status=0
+  fi
+fi
+
+rm -f ftest* ctest* core
+
+# Bye-bye.
+
+exit $status