The problem is in this custom check but I have no idea where exactly:
dnl Special check for sysconf() to ensure _SC_PAGESIZE is also available.
AC_CACHE_CHECK([for sysconf(_SC_PAGESIZE)], ac_cv_sysconf_with_sc_pagesize,
[AC_COMPILE_IFELSE(AC_LANG_PROGRAM([#include <unistd.h>], [sysconf(_SC_PAGESIZE)])],
if test x"$ac_cv_sysconf_with_sc_pagesize" = x"yes"; then
[Define to 1 if you have sysconf(_SC_PAGESIZE).])
It's probably over or underquoting, but I'm not even sure if it's worth keeping it around. Up to you.
fixed in 1.1.4