https://sourceforge.net/p/gputils/code/1288
https://bugs.gentoo.org/722648

--- a/configure.ac
+++ b/configure.ac
@@ -160,29 +160,41 @@
 AC_CHECK_FUNCS(strndup, , [IBERTYOBJS="$IBERTYOBJS strndup.o"])
 AC_CHECK_FUNCS(strverscmp, , [IBERTYOBJS="$IBERTYOBJS strverscmp.o"])
 
-AM_CFLAGS=
+VERSION_MAJOR=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $1}'`
+VERSION_MINOR=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $2}'`
+VERSION_MICRO=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $3}'`
+
+AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MAJOR, $VERSION_MAJOR, [gputils major version number])
+AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MINOR, $VERSION_MINOR, [gputils minor version number])
+AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MICRO, $VERSION_MICRO, [gputils micro version number])
+AC_DEFINE_UNQUOTED(GPUTILS_VERSION_STR, "$PACKAGE_VERSION", [gputils version string])
+
+AM_GPUTILS_SVN_VERSION="\$(shell \$(top_srcdir)/get_cl_revision.sh \$(top_srcdir)/ChangeLog)"
+AM_PACKAGE_SVN_VERSION=`./get_cl_revision.sh ChangeLog`
+
+AM_CFLAGS="-DGPUTILS_SVN_VERSION=\$(AM_GPUTILS_SVN_VERSION)"
 AM_LDFLAGS=
 
 # Options for the system on which the package will run.
 case "${host}" in
   *cygwin* )
     if test "x$GCC" = "xyes"; then
-      AM_CFLAGS="-Wall -pedantic"
+      AM_CFLAGS="$AM_CFLAGS -Wall -pedantic"
       AM_LDFLAGS="-Wl,-warn-common -Wl,-warn-once"
     fi
     ;;
   *darwin* )
     if test "x$CC" = "xclang"; then
-      AM_CFLAGS="-Wall -pedantic -Wformat -Wtautological-compare -Wimplicit-function-declaration -Wformat-security"
+      AM_CFLAGS="$AM_CFLAGS -Wall -pedantic -Wformat -Wtautological-compare -Wimplicit-function-declaration -Wformat-security"
     fi
     ;;
   *linux* )
     if test "x$CC" = "xclang"; then
-      AM_CFLAGS="-Wall -pedantic -Wformat -Wtautological-compare -Wimplicit-function-declaration -Wformat-security"
+      AM_CFLAGS="$AM_CFLAGS -Wall -pedantic -Wformat -Wtautological-compare -Wimplicit-function-declaration -Wformat-security"
       AM_LDFLAGS="-Wl,-warn-common -Wl,-warn-once"
     else
       if test "x$GCC" = "xyes"; then
-        AM_CFLAGS="-Wall -pedantic -Wformat -Wimplicit-function-declaration -Wformat-security"
+        AM_CFLAGS="$AM_CFLAGS -Wall -pedantic -Wformat -Wimplicit-function-declaration -Wformat-security"
         AM_LDFLAGS="-Wl,-warn-common -Wl,-warn-once"
       fi
     fi
@@ -192,33 +204,20 @@
   *-pc-os2_emx | *-pc-os2-emx )
     EXEEXT=".exe"
     if test "x$GCC" = "xyes"; then
-      AM_CFLAGS="-Zcrtdll"
+      AM_CFLAGS="$AM_CFLAGS -Zcrtdll"
     fi
     ;;
   *sun* )
     # sunos cc needs the -xCC flag for // comments
     if test "x$GCC" != "xyes"; then
-      AM_CFLAGS="-xCC" 
+      AM_CFLAGS="$AM_CFLAGS -xCC" 
     fi
     ;;
 esac
-
-VERSION_MAJOR=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $1}'`
-VERSION_MINOR=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $2}'`
-VERSION_MICRO=`echo $PACKAGE_VERSION | $AWK 'BEGIN {FS="."} {print $3}'`
-
-AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MAJOR, $VERSION_MAJOR, [gputils major version number])
-AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MINOR, $VERSION_MINOR, [gputils minor version number])
-AC_DEFINE_UNQUOTED(GPUTILS_VERSION_MICRO, $VERSION_MICRO, [gputils micro version number])
-AC_DEFINE_UNQUOTED(GPUTILS_VERSION_STR, "$PACKAGE_VERSION", [gputils version string])
-
-AM_GPUTILS_SVN_VERSION="\$(shell \$(top_srcdir)/get_cl_revision.sh \$(top_srcdir)/ChangeLog)"
-AM_PACKAGE_SVN_VERSION=`./get_cl_revision.sh ChangeLog`
-CFLAGS="-DGPUTILS_SVN_VERSION=\$(AM_GPUTILS_SVN_VERSION)"
 
 # Host filesystem options.
 case "${host}" in
-  *mingw* | *-pc-os2_emx | *-pc-os2-emx | *djgpp*)
+  *mingw* | *-pc-os2_emx | *-pc-os2-emx | *djgpp* )
     AC_DEFINE(HAVE_DOS_BASED_FILE_SYSTEM, 1, 
       [Define if your host uses a DOS based file system.])
     ;;
@@ -231,15 +230,13 @@
 fi
 
 if test x$enable_gdb_debuginfo = xyes; then
-  CFLAGS="$CFLAGS -ggdb"
+  AM_CFLAGS="$AM_CFLAGS -ggdb"
 fi
 
 if test x$enable_gputils_path = xyes; then
   AC_DEFINE(USE_DEFAULT_PATHS, 1,
     [Define if you want to add default search paths.])
 fi
-
-LDFLAGS=
 
 # Substitute configuration variables.
 AC_SUBST(ENABLE_HTML_DOC)
@@ -248,8 +245,6 @@
 AC_SUBST(AM_PACKAGE_SVN_VERSION)
 AC_SUBST(AM_CFLAGS)
 AC_SUBST(AM_LDFLAGS)
-AC_SUBST(CFLAGS)
-AC_SUBST(LDFLAGS)
 AC_SUBST(GPUTILS_HEADER_PATH)
 AC_SUBST(GPUTILS_LKR_PATH)
 AC_SUBST(GPUTILS_LIB_PATH)
@@ -301,6 +296,7 @@
   Source directory:     $srcdir
   Installation prefix:  $prefix
   C compiler:           $CC $AM_CFLAGS $CFLAGS
+  C linker:             $CC $AM_LDFLAGS
   Location of MPLAB-X:  $DEFAULT_MPLABX_PATH
 
 ])