compiler/lexer.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/compiler/lexer.cpp b/compiler/lexer.cpp
index 14e6d92..274b1a7 100755
--- a/compiler/lexer.cpp
+++ b/compiler/lexer.cpp
@@ -10,6 +10,7 @@
 #define YY_FLEX_MAJOR_VERSION 2
 #define YY_FLEX_MINOR_VERSION 5
 
+#include <unistd.h>
 #include <stdio.h>
 
 #if defined(__MWERKS__) && !__MACH__ && !YY_NEVER_INTERACTIVE