--- a/lineak/xmgr.cpp
+++ b/lineak/xmgr.cpp
@@ -21,6 +21,8 @@
 #include <lineak/lbutton.h>
 
 extern "C" {
+   #include <stdlib.h>
+   #include <string.h>
    #include <signal.h>
    #include <X11/Xlib.h>
    #include <X11/keysym.h>
--- a/lineak/defloader.h
+++ b/lineak/defloader.h
@@ -23,6 +23,7 @@
 #   endif
 
 #   include <lineak/loader.h>
+#   include <cstdlib>
 #   include <map>
 
 class LDef;
--- a/lineak/pluginmanager.cpp
+++ b/lineak/pluginmanager.cpp
@@ -34,6 +34,7 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <dlfcn.h>
+#include <string.h>
 }
 
 using namespace lineak_core_functions;
--- a/lineak/cdromctrl.cpp
+++ b/lineak/cdromctrl.cpp
@@ -51,6 +51,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <string.h>
 #include <unistd.h>
 
 }