LibRegex: Don't build LibRegex/C/Regex.cpp on Lagom

This file implements the POSIX APIs from <regex.h>, and is not suitable
for inclusion in a Lagom build. If we do include it, it will override
the host's regex functions and wreak havoc if it's resolved before the
host's implementation.

1 files changed, 4 insertions, 6 deletions

diff --git a/Userland/Libraries/LibRegex/C/Regex.cpp b/Userland/Libraries/LibRegex/C/Regex.cpp
index 28d93d5da6..b9a76394cc 100644
--- a/Userland/Libraries/LibRegex/C/Regex.cpp
+++ b/Userland/Libraries/LibRegex/C/Regex.cpp
@@ -6,19 +6,17 @@
 
 #include <AK/String.h>
 #include <AK/StringBuilder.h>
+#include <AK/Variant.h>
 #include <LibRegex/Regex.h>
 #include <ctype.h>
+#include <regex.h>
 #include <stdio.h>
 #include <string.h>
 
-#ifdef __serenity__
-#    include <regex.h>
-#else
-#    include <LibC/regex.h>
+#ifndef AK_OS_SERENITY
+#    error "This file is intended for use on Serenity only to implement POSIX regex.h"
 #endif
 
-#include <AK/Variant.h>
-
 struct internal_regex_t {
     u8 cflags;
     u8 eflags;