diff --git a/enscript-build.patch b/enscript-build.patch
new file mode 100644
index 0000000..b965083
--- /dev/null
+++ b/enscript-build.patch
@@ -0,0 +1,11 @@
+diff -up enscript-1.6.6/configure.ac.build enscript-1.6.6/configure.ac
+--- enscript-1.6.6/configure.ac.build	2012-09-25 21:22:49.000000000 +0200
++++ enscript-1.6.6/configure.ac	2012-09-26 15:46:10.988041135 +0200
+@@ -11,7 +11,6 @@ AC_PROG_INSTALL
+ AC_PROG_CC
+ 
+ AC_USE_SYSTEM_EXTENSIONS
+-AM_C_PROTOTYPES
+ 
+ AC_C_CONST
+ AC_FUNC_ALLOCA
diff --git a/enscript.spec b/enscript.spec
index 3fed256..59d4fb8 100644
--- a/enscript.spec
+++ b/enscript.spec
@@ -22,6 +22,8 @@ Patch8: enscript-wrap_header.patch
 
 Patch10:enscript-1.6.4-rh457720.patch
 Patch12:enscript-rh477382.patch
+Patch13:enscript-build.patch
+
 Requires(preun): /sbin/install-info
 Requires(post): /sbin/install-info
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -44,12 +46,14 @@ includes many options for customizing printouts
 %patch8 -p1 -b .wrap_header
 %patch10 -p1 -b .rh457720
 %patch12 -p1 -b .rh477382
+%patch13 -p1 -b .build
 
 %{__tar} -C states/hl -zxf %{SOURCE1} ruby.st
 install -pm 644 %{SOURCE2} states/hl/php.st
 
 %build
 autoreconf -fiv
+export CPPFLAGS='-DPROTOTYPES'
 %configure --with-media=Letter
 make %{?_smp_mflags}