Mark BROKEN: fails to stage

(system "cc -pipe -O0 -Wall -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wcast-qual -Wno-unused-label -Wno-uninitialized -fstack-protector -fno-strict-aliasing -fPIC -c -Wall edline.c")
edline.c:22:10: fatal error: 'readline/readline.h' file not found
#include <readline/readline.h>

^~~~~~~~~~~~~~~~~~~~~

...
install: /wrkdirs/usr/ports/lang/scm/work/scm/edline.so: No such file or directory

Reported by: pkg-fallout