diff --git a/pptp-1.7.2-parallel-build.patch b/pptp-1.7.2-parallel-build.patch
new file mode 100644
index 0000000..ebcef8c
--- /dev/null
+++ b/pptp-1.7.2-parallel-build.patch
@@ -0,0 +1,26 @@
+Index: Makefile
+===================================================================
+RCS file: /cvsroot/pptpclient/pptp-linux/Makefile,v
+retrieving revision 1.50
+diff -u -r1.50 Makefile
+--- Makefile	4 Jun 2010 01:04:12 -0000	1.50
++++ Makefile	11 Nov 2011 13:31:16 -0000
+@@ -48,11 +48,13 @@
+ pptpsetup.8: pptpsetup
+ 	pod2man $? > $@
+ 
+-config.h: 
+-	echo "/* text added by Makefile target config.h */" > config.h
+-	echo "#define PPTP_LINUX_VERSION \"$(VERSION)$(RELEASE)\"" >> config.h
+-	echo "#define PPPD_BINARY \"$(PPPD)\"" >> config.h
+-	echo "#define IP_BINARY \"$(IP)\"" >> config.h
++config.h:
++	( \
++	echo "/* text added by Makefile target config.h */"; \
++	echo "#define PPTP_LINUX_VERSION \"$(VERSION)$(RELEASE)\""; \
++	echo "#define PPPD_BINARY \"$(PPPD)\""; \
++	echo "#define IP_BINARY \"$(IP)\"" \
++	) > config.h
+ 
+ vector_test: vector_test.o vector.o
+ 	$(CC) -o vector_test vector_test.o vector.o
diff --git a/pptp.spec b/pptp.spec
index 289dd08..fa02066 100644
--- a/pptp.spec
+++ b/pptp.spec
@@ -1,6 +1,6 @@
 Name:		pptp
 Version:	1.7.2
-Release:	13%{?dist}
+Release:	13.1%{?dist}
 Summary:	Point-to-Point Tunneling Protocol (PPTP) Client
 Group:		Applications/Internet
 License:	GPLv2+
@@ -19,6 +19,7 @@ Patch8:		pptp-1.7.2-conn-free2.patch
 Patch9:		pptp-1.7.2-call-disconnect-notify.patch
 Patch10:	pptp-1.7.2-so_mark.patch
 Patch11:	pptp-1.7.2-nohostroute-option.patch
+Patch12:	pptp-1.7.2-parallel-build.patch
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(id -nu)
 Requires:	ppp >= 2.4.2, /sbin/ip
 %if 0%{?fedora} > 14
@@ -53,6 +54,7 @@ tunnels.
 
 # Fix Makefile dependencies to support parallel make (applied upstream)
 %patch3 -p0 -b .makedeps
+%patch12 -p0 -b .parallel
 
 # Don't check for MPPE capability in kernel or pppd unless we're creating a
 # tunnel that requires encryption (applied upstream)
@@ -86,7 +88,8 @@ tunnels.
 perl -pi -e 's/install -o root -m 555 pptp/install -m 755 pptp/;' Makefile
 
 %build
-make %{?_smp_mflags} CFLAGS="-Wall %{optflags}" IP=/sbin/ip
+OUR_CFLAGS="$(echo X%{optflags} | sed -e 's/^X//; s/-O[0-9]* /-O0 /')"
+make %{?_smp_mflags} CFLAGS="-Wall $OUR_CFLAGS" IP=/sbin/ip
 
 %install
 rm -rf %{buildroot}
@@ -123,6 +126,11 @@ rm -rf %{buildroot}
 %{_mandir}/man8/pptpsetup.8*
 
 %changelog
+* Fri Nov 11 2011 Paul Howarth <paul@city-fan.org> 1.7.2-13.1
+- Drop compiler optimization level to -O0 as per upstream in attempt to
+  resolve occasional segfault in pptpcm (#749455)
+- Add patch to fix highly-parallel build (e.g. -j16)
+
 * Tue Nov  8 2011 Paul Howarth <paul@city-fan.org> 1.7.2-13
 - Patch to fix broken Call-Disconnect-Notify code accepted upstream
 - Add upstream patch to support setting SO_MARK for the PPTP TCP control