--- src/C_XS/ToolBox.h.orig 2012-05-31 14:06:57.349640025 +0200 +++ src/C_XS/ToolBox.h 2012-05-31 14:07:59.988196069 +0200 @@ -93,7 +93,10 @@ #elif PERL_DARWIN #define boolean bool #else - typedef enum { false = FALSE, true = TRUE } boolean; + typedef int boolean; + #ifndef I_STDBOOL + enum { false, true }; + #endif #endif #endif