Hi, >DEB_BUILD_MAINT_OPTIONS=hardening=+all dpkg-buildflags --get CFLAGS >-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security In case of ghc the harderning flags are turned off https://sources.debian.net/src/ghc/7.10.3-9/debian/rules/ and yes, I'm going to commit that in experimental, lets hope it doesn't break anything (but if we package stackage nightly on experimental we will know in advance) cheers, G.