Index: trunk/config.h.in
===================================================================
--- trunk/config.h.in	(revision 18826)
+++ trunk/config.h.in	(revision 18827)
@@ -52,6 +52,9 @@
 print {\n\n/* Wether setenv() works */\n}
 print_ternary ?libs/env/setenv/presents {#define PCB_HAVE_SETENV 1} {/* #undef PCB_HAVE_SETENV */}
 
+print {\n\n/* Wether putenv() works */\n}
+print_ternary ?libs/env/putenv/presents {#define PCB_HAVE_PUTENV 1} {/* #undef PCB_HAVE_PUTENV */}
+
 print {\n\n/* Wether usleep() works */\n}
 print_ternary ?libs/time/usleep/presents {#define PCB_HAVE_USLEEP 1} {/* #undef PCB_HAVE_USLEEP */}
 
Index: trunk/scconfig/hooks.c
===================================================================
--- trunk/scconfig/hooks.c	(revision 18826)
+++ trunk/scconfig/hooks.c	(revision 18827)
@@ -393,6 +393,8 @@
 
 	require("signal/names/*",  0, 0);
 	require("libs/env/setenv/*",  0, 0);
+	if (!istrue(get("libs/env/setenv/presents")))
+		require("libs/env/putenv/*",  0, 0);
 	require("libs/fs/mkdtemp/*",  0, 0);
 	require("libs/fs/realpath/*",  0, 0);
 	require("libs/fs/readdir/*",  0, 1);