--- pam-1.1.5.ebuild.orig	2012-12-05 22:57:35.892410749 +0100
+++ pam-1.1.5.ebuild	2012-12-05 23:04:39.209563820 +0100
@@ -83,6 +83,14 @@
 }
 
 src_prepare() {
+	if tc-is-cross-compiler && ! [ -e "${EROOT}"/usr/$(get_libdir)/libfl.a ]; then
+		eerror ""
+		eerror "Cannot cross-compile because sys-devel/flex is not installed in the target."
+		eerror "Please install sys-devel/flex into the target filesystem and try again."
+		eerror ""
+		die "flex is not installed"
+	fi
+
 	epatch "${FILESDIR}"/${MY_P}+glibc-2.16.patch
 
 	elibtoolize