diff --git a/modules/gralloc/mapper.cpp b/modules/gralloc/mapper.cpp
index 1ab70ec..75a9bb6 100644
--- a/modules/gralloc/mapper.cpp
+++ b/modules/gralloc/mapper.cpp
@@ -18,6 +18,7 @@
 #include <errno.h>
 #include <pthread.h>
 #include <unistd.h>
+#include <string.h>
 
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -35,6 +36,14 @@
 // we need this for now because pmem cannot mmap at an offset
 #define PMEM_HACK   1
 
+/* desktop Linux needs a little help with gettid() */
+#if defined(ARCH_X86) && !defined(HAVE_ANDROID_OS)
+#define __KERNEL__
+# include <linux/unistd.h>
+pid_t gettid() { return syscall(__NR_gettid);}
+#undef __KERNEL__
+#endif
+
 /*****************************************************************************/
 
 static int gralloc_map(gralloc_module_t const* module,