diff --git a/libvmime.changes b/libvmime.changes
index bfd7172..9b079a3 100644
--- a/libvmime.changes
+++ b/libvmime.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu May 10 00:13:33 UTC 2012 - crrodriguez@opensuse.org
+
+- Use RPM_OPT_FLAGS
+- Do not use -ansi gcc flag.
+
 -------------------------------------------------------------------
 Fri Mar 16 12:33:11 UTC 2012 - jengelh@medozas.de
 
diff --git a/libvmime.spec b/libvmime.spec
index f00d0e0..7392cd3 100644
--- a/libvmime.spec
+++ b/libvmime.spec
@@ -37,6 +37,7 @@ Patch3:         vmime-0.8.1-charset-catch.diff
 Patch4:         vmime-0.9.2-header-value-on-next-line.diff
 Patch5:         vmime-mixed-qp-in-parameter.diff
 Patch6:         vmime-0.9.2-qp-in-buffers.diff
+Patch7:         vmime-noansiflag.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  autoconf
 BuildRequires:  automake
@@ -101,8 +102,11 @@ complete mail client.
 %prep
 %setup -qn vmime
 %patch -P 1 -P 2 -P 3 -P 4 -P 5 -P 6 -p1
+%patch7
 
 %build
+export CXXFLAGS="%optflags"
+export CFLAGS="%optflags"
 # sendmail's awesome location.
 export PATH="$PATH:/usr/sbin";
 %if 0%{?suse_version} >= 1100
diff --git a/vmime-noansiflag.patch b/vmime-noansiflag.patch
new file mode 100644
index 0000000..e78b27c
--- /dev/null
+++ b/vmime-noansiflag.patch
@@ -0,0 +1,51 @@
+--- SConstruct.orig
++++ SConstruct
+@@ -595,8 +595,6 @@ env.Append(CPPDEFINES = ['_REENTRANT=1']
+ 
+ env.Append(CXXFLAGS = ['-W'])
+ env.Append(CXXFLAGS = ['-Wall'])
+-env.Append(CXXFLAGS = ['-ansi'])
+-env.Append(CXXFLAGS = ['-pedantic'])
+ env.Append(CXXFLAGS = ['-Wpointer-arith'])
+ env.Append(CXXFLAGS = ['-Wold-style-cast'])
+ env.Append(CXXFLAGS = ['-Wconversion'])
+@@ -609,8 +607,6 @@ env.Append(TARFLAGS = ['--bzip2'])
+ if env['debug'] == 'yes':
+ 	env.Append(CXXFLAGS = ['-g'])
+ 	env.Append(CXXFLAGS = ['-O0'])
+-else:
+-	env.Append(CXXFLAGS = ['-O2'])
+ 	#-fomit-frame-pointer -fmove-all-movables -fstrict-aliasing
+ 
+ #env.Append(LIBS = ['additional-lib-here'])
+@@ -1299,7 +1295,9 @@ VMIME_ADDITIONAL_PC_LIBS=""
+ # Check compilers, processors, etc
+ #
+ 
+-AC_PROG_CC
++AC_PROG_CC_STDC
++AC_USE_SYSTEM_EXTENSIONS
++AC_SYS_LARGEFILE
+ AC_PROG_CXX
+ AC_PROG_CPP
+ AC_C_CONST
+@@ -1839,8 +1837,8 @@ AC_SUBST(PKGCONFIG_LIBS)
+ EXTRA_CFLAGS="$EXTRA_CFLAGS -D_REENTRANT=1 -D_THREAD_SAFE=1 $LIBGNUTLS_CFLAGS"
+ EXTRA_LIBS="$GSASL_LIBS $LIBGNUTLS_LIBS"
+ 
+-CFLAGS=""
+-CXXFLAGS=""
++CFLAGS+=""
++CXXFLAGS+=""
+ 
+ # -- Debug
+ if test x$VMIME_DEBUG = x1 ; then
+@@ -1868,7 +1866,7 @@ EXTRA_CFLAGS="$EXTRA_CFLAGS $lt_prog_com
+ 
+ """)
+ 
+-	compilerFlags = [ '-ansi', '-pedantic', '-W', '-Wall', '-Wpointer-arith', '-Wold-style-cast', '-Wconversion' ]
++	compilerFlags = [ '-W', '-Wall', '-Wpointer-arith', '-Wold-style-cast', '-Wconversion' ]
+ 
+ 	for f in compilerFlags:
+ 		configure_in.write('# ' + f + '\n')