Only in pycairo/files: pycairo-install.patch
diff -ur pycairo.orig/pycairo-1.10.0-r2.ebuild pycairo/pycairo-1.10.0-r2.ebuild
--- pycairo.orig/pycairo-1.10.0-r2.ebuild	2012-03-03 05:19:37.699879592 +0800
+++ pycairo/pycairo-1.10.0-r2.ebuild	2012-03-03 05:14:47.514889809 +0800
@@ -32,6 +32,8 @@
 PYTHON_CFLAGS=("2.* + -fno-strict-aliasing")
 
 src_prepare() {
+	epatch "${FILESDIR}"/${PN}-install.patch
+
 	pushd "${WORKDIR}/pycairo-${PYCAIRO_PYTHON3_VERSION}" > /dev/null
 	rm -f src/config.h || die
 	epatch "${FILESDIR}/${PN}-1.10.0-svg_check.patch"