--- a/src/quazip/ioapi.h
+++ b/src/quazip/ioapi.h
@@ -1,3 +1,4 @@
+#define OF(x) x
 /* ioapi.h -- IO base function header for compress/uncompress .zip
    files using zlib + zip or unzip API
 
--- a/src/quazip/unzip.c
+++ b/src/quazip/unzip.c
@@ -1,3 +1,4 @@
+#define OF(x) x
 /* unzip.c -- IO for uncompress .zip files using zlib
    Version 1.01e, February 12th, 2005
 
--- a/src/quazip/unzip.h
+++ b/src/quazip/unzip.h
@@ -1,3 +1,4 @@
+#define OF(x) x
 /* unzip.h -- IO for uncompress .zip files using zlib
    Version 1.01e, February 12th, 2005
 
--- a/src/quazip/zip.c
+++ b/src/quazip/zip.c
@@ -1,3 +1,4 @@
+#define OF(x) x
 /* zip.c -- IO on .zip files using zlib
    Version 1.01e, February 12th, 2005
 
--- a/src/quazip/zip.h
+++ b/src/quazip/zip.h
@@ -1,3 +1,4 @@
+#define OF(x) x
 /* zip.h -- IO for compress .zip files using zlib
    Version 1.01e, February 12th, 2005
 
