--- configure
+++ configure
@@ -3551,7 +3551,7 @@
 # we don't want those default flags to be carried over into the
 # rest of the build system since we have other means of controlling
 # debugging symbol generation and optimization.
-CONFIG_CFLAGS="${CFLAGS}"
+CONFIG_CFLAGS=$(echo "${CFLAGS}" | sed -r -e 's,-O[^ ]*( |$),,g') # asterisk expects optimization flags to be passed in OPTIMIZE, CFLAGS should not contain any of the optimization flags
 CONFIG_LDFLAGS="${LDFLAGS}"