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diff --git a/libhashkit/fnv_64.cc b/libhashkit/fnv_64.cc
index 68e4dd0..64656b7 100644
--- a/libhashkit/fnv_64.cc
+++ b/libhashkit/fnv_64.cc
@@ -37,8 +37,9 @@
#include <libhashkit/common.h>
+#include <limits.h>
-#if __WORDSIZE == 64 && defined(HAVE_FNV64_HASH)
+#if (LONG_BITS == 64) && defined(HAVE_FNV64_HASH)
/* FNV hash'es lifted from Dustin Sallings work */
static uint64_t FNV_64_INIT= 0xcbf29ce484222325;
diff --git a/libhashkit/has.cc b/libhashkit/has.cc
index 843e32e..4153e5e 100644
--- a/libhashkit/has.cc
+++ b/libhashkit/has.cc
@@ -37,6 +37,7 @@
#include <libhashkit/common.h>
+#include <limits.h>
bool libhashkit_has_algorithm(const hashkit_hash_algorithm_t algo)
{
@@ -44,7 +45,7 @@ bool libhashkit_has_algorithm(const hashkit_hash_algorithm_t algo)
{
case HASHKIT_HASH_FNV1_64:
case HASHKIT_HASH_FNV1A_64:
-#if __WORDSIZE == 64 && defined(HAVE_FNV64_HASH)
+#if (LONG_BITS == 64) && defined(HAVE_FNV64_HASH)
return true;
#else
return false;
diff --git a/libtest/cmdline.cc b/libtest/cmdline.cc
index 29a22de..161c646 100644
--- a/libtest/cmdline.cc
+++ b/libtest/cmdline.cc
@@ -61,7 +61,7 @@ using namespace libtest;
#include <algorithm>
#include <stdexcept>
-#ifndef __USE_GNU
+#ifndef _GNU_SOURCE
static char **environ= NULL;
#endif
@@ -201,7 +201,7 @@ Application::error_t Application::run(const char *args[])
fatal_assert(posix_spawnattr_setsigmask(&spawnattr, &mask) == 0);
-#if defined(POSIX_SPAWN_USEVFORK) || defined(__linux__)
+#if defined(POSIX_SPAWN_USEVFORK) || defined(__GLIBC__)
// Use USEVFORK on linux
flags |= POSIX_SPAWN_USEVFORK;
#endif
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