diff --git a/gtk/configure.ac b/gtk/configure.ac
index e3bab4eb..50f204f3 100644
--- a/gtk/configure.ac
+++ b/gtk/configure.ac
@@ -331,9 +331,9 @@ if test no != "$with_system_zip" && test yes = "$with_zlib" ; then
 	LIBS="$LIBS $SYSTEM_ZIP_LIBS"
     ],[
 	if test check = "$with_system_zip"; then
-	    AC_MSG_WARN(Cannot find SYSTEM_ZIP)
+	    AC_MSG_WARN(Cannot find system minizip library)
 	else
-	    AC_MSG_ERROR(--with-system-zip given but cannot find proper zlib)
+	    AC_MSG_ERROR(--with-system-zip given but cannot find system minizip library)
 	fi
     ])
 fi
diff --git a/unix/configure b/unix/configure
index 699f40e6..14be08d5 100755
--- a/unix/configure
+++ b/unix/configure
@@ -5046,20 +5046,20 @@ fi
 	echo "$SYSTEM_ZIP_PKG_ERRORS" >&5
 
 	if test "x${with_system_zip}" != "xcheck"; then
-				as_fn_error $? "--with-system-zip requested but no proper zlib found." "$LINENO" 5
+				as_fn_error $? "--with-system-zip requested but no proper minizip lib found." "$LINENO" 5
 			else
-				{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: zlib not found. Build without SYSTEM_ZIP support." >&5
-$as_echo "$as_me: WARNING: zlib not found. Build without SYSTEM_ZIP support." >&2;}
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: minizip not found. Build without SYSTEM_ZIP support." >&5
+$as_echo "$as_me: WARNING: minizip not found. Build without SYSTEM_ZIP support." >&2;}
 			fi
 
 elif test $pkg_failed = untried; then
      	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 	if test "x${with_system_zip}" != "xcheck"; then
-				as_fn_error $? "--with-system-zip requested but no proper zlib found." "$LINENO" 5
+				as_fn_error $? "--with-system-zip requested but no proper minizip lib found." "$LINENO" 5
 			else
-				{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: zlib not found. Build without SYSTEM_ZIP support." >&5
-$as_echo "$as_me: WARNING: zlib not found. Build without SYSTEM_ZIP support." >&2;}
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: minizip not found. Build without SYSTEM_ZIP support." >&5
+$as_echo "$as_me: WARNING: minizip not found. Build without SYSTEM_ZIP support." >&2;}
 			fi
 
 else
diff --git a/unix/configure.ac b/unix/configure.ac
index 47f37808..28186c67 100644
--- a/unix/configure.ac
+++ b/unix/configure.ac
@@ -222,9 +222,9 @@ if test "x$enable_zip" = "xyes"; then
 			fi
 			S9XDEFS="$S9XDEFS -DSYSTEM_ZIP",
 			if test "x${with_system_zip}" != "xcheck"; then
-				AC_MSG_ERROR([--with-system-zip requested but no proper zlib found.])
+				AC_MSG_ERROR([--with-system-zip requested but no proper minizip lib found.])
 			else
-				AC_MSG_WARN([zlib not found. Build without SYSTEM_ZIP support.])
+				AC_MSG_WARN([minizip not found. Build without SYSTEM_ZIP support.])
 			fi
 		)
 	else