--- a/net-im/prosody/prosody-0.7.0.ebuild	
+++ a/net-im/prosody/prosody-0.7.0.ebuild	
@@ -43,11 +43,15 @@ src_prepare() {
 }
 
 src_configure() {
+	# the configure script is handcrafted (and yells at unknown options)
+	# hence do not use 'econf'
 	./configure --prefix="/usr" \
 		--sysconfdir="${JABBER_ETC}" \
 		--datadir="${JABBER_SPOOL}" \
 		--with-lua-lib=/usr/$(get_libdir)/lua \
 		--c-compiler="$(tc-getCC)" --linker="$(tc-getCC)" \
+		--cflags="${CFLAGS} -Wall -fPIC" \
+		--ldflags="${LDFLAGS} -shared" \
 		--require-config || die "configure failed"
 }