Adding linux specific env implementation.
diff --git a/Makefile b/Makefile
index 7f4c7dc..2447aeb 100644
--- a/Makefile
+++ b/Makefile
@@ -1216,6 +1216,7 @@
     src/core/support/cmdline.c \
     src/core/support/cpu_linux.c \
     src/core/support/cpu_posix.c \
+    src/core/support/env_linux.c \
     src/core/support/env_posix.c \
     src/core/support/env_win32.c \
     src/core/support/file.c \
@@ -1310,6 +1311,7 @@
 objs/$(CONFIG)/src/core/support/cmdline.o: 
 objs/$(CONFIG)/src/core/support/cpu_linux.o: 
 objs/$(CONFIG)/src/core/support/cpu_posix.o: 
+objs/$(CONFIG)/src/core/support/env_linux.o: 
 objs/$(CONFIG)/src/core/support/env_posix.o: 
 objs/$(CONFIG)/src/core/support/env_win32.o: 
 objs/$(CONFIG)/src/core/support/file.o: