diff --git a/backends/libpurple/main.cpp b/backends/libpurple/main.cpp
index 182e21c2dad20260a1a1d828e6ff0cf73dec1a42..c5c85adb6d8b8da377921bd754d44b678631e3c0 100644
--- a/backends/libpurple/main.cpp
+++ b/backends/libpurple/main.cpp
@@ -17,7 +17,7 @@
 #include "geventloop.h"
 
 // #include "valgrind/memcheck.h"
-#ifndef __FreeBSD__
+#if !defined(__FreeBSD__) && !defined(__APPLE__)
 #include "malloc.h"
 #endif
 #include <algorithm>
@@ -417,7 +417,7 @@ class SpectrumNetworkPlugin : public NetworkPlugin {
 
 				purple_accounts_delete_wrapped(account);
 #ifndef WIN32
-#ifndef __FreeBSD__
+#if !defined(__FreeBSD__) && !defined(__APPLE__)
 				malloc_trim(0);
 #endif
 #endif
@@ -1583,7 +1583,7 @@ static void signed_on(PurpleConnection *gc, gpointer unused) {
 	PurpleAccount *account = purple_connection_get_account_wrapped(gc);
 	np->handleConnected(np->m_accounts[account]);
 #ifndef WIN32
-#ifndef __FreeBSD__
+#if !defined(__FreeBSD__) && !defined(__APPLE__)
 	// force returning of memory chunks allocated by libxml2 to kernel
 	malloc_trim(0);
 #endif
@@ -1782,7 +1782,7 @@ static void transportDataReceived(gpointer data, gint source, PurpleInputConditi
 
 int main(int argc, char **argv) {
 #ifndef WIN32
-#ifndef __FreeBSD__
+#if !defined(__FreeBSD__) && !defined(__APPLE__)
 		mallopt(M_CHECK_ACTION, 2);
 		mallopt(M_PERTURB, 0xb);
 #endif
diff --git a/backends/libyahoo2/yahoo/crypt.c b/backends/libyahoo2/yahoo/crypt.c
index 9e215d8ae1d61f4ff88455e7bfbe57d04f5cadc6..1483ac46a20ff1cd9bb7f0c6f46a460b770095e4 100644
--- a/backends/libyahoo2/yahoo/crypt.c
+++ b/backends/libyahoo2/yahoo/crypt.c
@@ -23,7 +23,11 @@
  * freebsd, crypt works properly on those systems. i hate solaris */
 
 #if HAVE_CONFIG_H
-#  include <config.h>
+# include <config.h>
+#endif
+
+#ifdef __APPLE__
+#define HAVE_STRING_H 1
 #endif
 
 #if HAVE_STRING_H
diff --git a/backends/libyahoo2/yahoo/libyahoo2.c b/backends/libyahoo2/yahoo/libyahoo2.c
index f33f1365dd7b99409e8b9f0f06db431cd9c307d0..46b487cc349279c63a2eed45d25e2b6aa6a85b02 100644
--- a/backends/libyahoo2/yahoo/libyahoo2.c
+++ b/backends/libyahoo2/yahoo/libyahoo2.c
@@ -51,6 +51,10 @@
 # include <config.h>
 #endif
 
+#if __APPLE__
+#define STDC_HEADERS 1
+#endif
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
diff --git a/backends/libyahoo2/yahoo/yahoo_util.c b/backends/libyahoo2/yahoo/yahoo_util.c
index add6d81abc65ec933c3df466a1f99192a5c3107d..92e8d31e95d4a07836e8888f759cb129c29b9fcb 100644
--- a/backends/libyahoo2/yahoo/yahoo_util.c
+++ b/backends/libyahoo2/yahoo/yahoo_util.c
@@ -23,6 +23,10 @@
 # include <config.h>
 #endif
 
+#if __APPLE__
+#define STDC_HEADERS 1
+#endif
+
 #if STDC_HEADERS
 # include <string.h>
 #else
diff --git a/backends/libyahoo2/yahoo/yahoo_util.h b/backends/libyahoo2/yahoo/yahoo_util.h
index cc92486740b1613be47ffe566d7a6bdb802c4a6a..03efd716e4a54a57214bbd2325fa1aee92aca908 100644
--- a/backends/libyahoo2/yahoo/yahoo_util.h
+++ b/backends/libyahoo2/yahoo/yahoo_util.h
@@ -64,7 +64,7 @@ void *y_memdup(const void *addr, int n);
 char **y_strsplit(char *str, char *sep, int nelem);
 void y_strfreev(char **vector);
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(__APPLE__)
 int strncasecmp(const char *s1, const char *s2, size_t n);
 int strcasecmp(const char *s1, const char *s2);