diff --git a/src/auto/configure b/src/auto/configure
index bb079f0..63da098 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -4221,7 +4221,7 @@
     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 @@
 
   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 df28a24..8f0dce4 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -204,7 +204,8 @@
     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 "$GCC" = yes -a "$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 d7d4f2a..6f9fea2 100755
--- a/src/osdef.sh
+++ b/src/osdef.sh
@@ -47,11 +47,7 @@
 #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 93faccb..a054f62 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    68,
+/**/
     67,
 /**/
     66,