diff --git a/src/auto/configure b/src/auto/configure
index bb079f0fc0bbc3c79c313ffb9398143625e30a06..63da09823f5d598de4468c1a49d2d1679e6d42b1 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -4221,7 +4221,7 @@ rm -f core conftest.err conftest.$ac_objext \
     MACOSX=yes
     OS_EXTRA_SRC="os_macosx.m os_mac_conv.c";
     OS_EXTRA_OBJ="objects/os_macosx.o objects/os_mac_conv.o"
-        CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX -no-cpp-precomp"
+            CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX"
 
                 # On IRIX 5.3, sys/types and inttypes.h are conflicting.
 for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
@@ -4311,7 +4311,7 @@ fi
 
   if test "$GCC" = yes -a "$local_dir" != no; then
     echo 'void f(){}' > conftest.c
-        have_local_include=`${CC-cc} -no-cpp-precomp -c -v conftest.c 2>&1 | grep "${local_dir}/include"`
+        have_local_include=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/include"`
     have_local_lib=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/lib"`
     rm -f conftest.c conftest.o
   fi
diff --git a/src/configure.in b/src/configure.in
index df28a246b792906a639d5fd54d9fb2a6f1fd4c40..8f0dce4c3eedf4fb6e8b45fbc72930bdc867ebf4 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -204,7 +204,8 @@ if test "`(uname) 2>/dev/null`" = Darwin; then
     OS_EXTRA_SRC="os_macosx.m os_mac_conv.c";
     OS_EXTRA_OBJ="objects/os_macosx.o objects/os_mac_conv.o"
     dnl TODO: use -arch i386 on Intel machines
-    CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX -no-cpp-precomp"
+    dnl Removed -no-cpp-precomp, only for very old compilers.
+    CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX"
 
     dnl If Carbon is found, assume we don't want X11
     dnl unless it was specifically asked for (--with-x)
@@ -262,8 +263,8 @@ if test "$cross_compiling" = no; then
   ])
   if test "$GCC" = yes -a "$local_dir" != no; then
     echo 'void f(){}' > conftest.c
-    dnl -no-cpp-precomp is needed for OS X 10.2 (Ben Fowler)
-    have_local_include=`${CC-cc} -no-cpp-precomp -c -v conftest.c 2>&1 | grep "${local_dir}/include"`
+    dnl Removed -no-cpp-precomp, only needed for OS X 10.2 (Ben Fowler)
+    have_local_include=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/include"`
     have_local_lib=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/lib"`
     rm -f conftest.c conftest.o
   fi
diff --git a/src/osdef.sh b/src/osdef.sh
index d7d4f2ac26286a135cb13c4dc1f425b00c81b32b..6f9fea28b5cc12d2a14e2d9bb9601baf95a7083b 100755
--- a/src/osdef.sh
+++ b/src/osdef.sh
@@ -47,11 +47,7 @@ cat << EOF > osdef0.c
 #endif
 EOF
 
-# Mac uses precompiled headers, but we need real headers here.
-case `uname` in
-    Darwin)	$CC -I. -I$srcdir -E -no-cpp-precomp osdef0.c >osdef0.cc;;
-    *)		$CC -I. -I$srcdir -E osdef0.c >osdef0.cc;;
-esac
+$CC -I. -I$srcdir -E osdef0.c >osdef0.cc
 
 # insert a space in front of each line, so that a function name at the
 # start of the line is matched with "[)*, 	]\1[ 	(]"
diff --git a/src/version.c b/src/version.c
index 93faccbdf06bff4fb2751dda6c075887ac09cdae..a054f62c7b9375b553532e339b58c2b950b2d4fd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    68,
 /**/
     67,
 /**/