Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -571,11 +571,11 @@
 	AC_DEFINE(OF_HAVE_ATOMIC_OPS, 1, [Whether we have atomic operations])
 	AC_SUBST(ATOMIC_H, "atomic.h")
 ])
 AC_MSG_RESULT($atomic_ops)
 
-AC_CHECK_FUNCS([gmtime_r localtime_r nanosleep])
+AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep])
 
 AC_CHECK_HEADERS([pwd.h grp.h])
 AC_CHECK_FUNC(chmod, [
 	AC_DEFINE(OF_HAVE_CHMOD, 1, [Whether we have chmod()])
 ])

Index: src/OFSystemInfo.m
==================================================================
--- src/OFSystemInfo.m
+++ src/OFSystemInfo.m
@@ -49,15 +49,15 @@
 #elif defined(__QNX__)
 	if ((pageSize = sysconf(_SC_PAGESIZE)) < 1)
 		pageSize = 4096;
 	numberOfCPUs = _syspage_ptr->num_cpu;
 #else
-# ifdef _SC_PAGESIZE
+# if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
 	if ((pageSize = sysconf(_SC_PAGESIZE)) < 1)
 # endif
 		pageSize = 4096;
-# ifdef _SC_NPROCESSORS_CONF
+# if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF)
 	if ((numberOfCPUs = sysconf(_SC_NPROCESSORS_CONF)) < 1)
 # endif
 		numberOfCPUs = 1;
 #endif
 }