Source
remove default debug and warning flags
--- configure.ac.orig 2018-05-24 08:24:31.000000000 -0700
+++ configure.ac 2019-01-26 23:50:37.000000000 -0700
# set CFLAGS and CXXFLAGS
#user_CFLAGS="${CXXFLAGS}"
user_CFLAGS=${CFLAGS}
-generic_CFLAGS="-Wall -Wno-strict-aliasing -g -gdwarf-2 -Wuninitialized"
+generic_CFLAGS=""
ext_CFLAGS=""
debug_CFLAGS=""
user_LDFLAGS="$LDFLAGS"