commit 889fe32d75a24b7a5620ebdeeabd0a6af6654385
Author: Jeroen Roovers <jer@gentoo.org>
Date:   Mon Nov 4 10:36:05 2019 +0100

    dev-python/pygresql: Respect CFLAGS
    
    The only valid CFLAGS additions in extra_compile_args are
    -funsigned-char and -Wall, even if the latter does not affect what is
    installed. Remove -O2 and -Werror.
    
    Package-Manager: Portage-2.3.78, Repoman-2.3.17
    Fixes: https://bugs.gentoo.org/688286
    Signed-off-by: Jeroen Roovers <jer@gentoo.org>

diff --git a/dev-python/pygresql/files/pygresql-5.1-CFLAGS.patch b/dev-python/pygresql/files/pygresql-5.1-CFLAGS.patch
new file mode 100644
index 00000000000..480d0a3dc4c
--- /dev/null
+++ b/dev-python/pygresql/files/pygresql-5.1-CFLAGS.patch
@@ -0,0 +1,11 @@
+--- a/setup.py
++++ b/setup.py
+@@ -101,7 +101,7 @@
+ library_dirs = [get_python_lib(), pg_config('libdir')]
+ define_macros = [('PYGRESQL_VERSION', version)]
+ undef_macros = []
+-extra_compile_args = ['-O2', '-funsigned-char', '-Wall', '-Werror']
++extra_compile_args = ['-funsigned-char', '-Wall']
+ 
+ 
+ class build_pg_ext(build_ext):
diff --git a/dev-python/pygresql/pygresql-5.1.ebuild b/dev-python/pygresql/pygresql-5.1.ebuild
index 1f1d7861a4f..12703a26534 100644
--- a/dev-python/pygresql/pygresql-5.1.ebuild
+++ b/dev-python/pygresql/pygresql-5.1.ebuild
@@ -22,11 +22,9 @@ DEPEND="${POSTGRES_DEP}"
 RDEPEND="${DEPEND}"
 
 S="${WORKDIR}/${MY_P}"
-
-src_prepare() {
-	sed "s/, '-Wall'//" -i setup.py || die
-	default
-}
+PATCHES=(
+	"${FILESDIR}"/${PN}-5.1-CFLAGS.patch
+)
 
 python_install_all() {
 	local DOCS=( docs/*.rst docs/community/* docs/contents/tutorial.rst )