Problems with Apache, PHP and mhash

I am on a FreeBSD using (a slightly modified version of) the FreeBSD port to build Apache with mod_ssl and php3, itself with mcrypt, mhash, gd and IMAP. When I attempt to build with mhash, the resulting binary gets caught in a loop like this: #251037 0x28297943 in readv () #251038 0x282295bb in .cerror () #251039 0x282885a2 in _thread_fd_lock () #251040 0x28297943 in readv () #251041 0x282295bb in .cerror () #251042 0x282885a2 in _thread_fd_lock () #251043 0x28297943 in readv () #251044 0x282295bb in .cerror () #251045 0x281bfb7e in mm_core_create () #251046 0x281bf21a in mm_create () #251047 0x80bb656 in ap_mm_create () #251048 0x80a29a3 in ap_init_alloc_shared () #251049 0x80adc1d in main () #251050 0x8062851 in _start () When I compile without mhash, there are no problems at all. My next try will be to compile with -g, but I was hoping someone would recognize the symptom first.