commit https://github.com/vim/vim/commit/32d03b34ac8a34a962f57847fc431a2b4e14efea Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 19 13:46:48 2015 +0100 patch 7.4.924 Problem: DEVELOPER_DIR gets reset by configure. Solution: Do not reset DEVELOPER_DIR when there is no --with-developer-dir argument. (Kazuki Sakamoto, closes #482)

/* auto/if_perl.c */
int perl_enabled __ARGS((int verbose));
void perl_end __ARGS((void));
void msg_split __ARGS((char_u *s, int attr));
void perl_win_free __ARGS((win_T *wp));
void perl_buf_free __ARGS((buf_T *bp));
void ex_perl __ARGS((exarg_T *eap));
void ex_perldo __ARGS((exarg_T *eap));