Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -455,11 +455,12 @@
 		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
 	])
 ])
 
 AS_IF([test x"$GOBJC" = x"yes"], [
-	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Werror"
+	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wcast-align -Wpointer-arith"
+	OBJCFLAGS="$OBJCFLAGS -Werror"
 
 	AC_MSG_CHECKING(whether gcc has bug objc/27438)
 	AC_TRY_COMPILE([
 		#import <objc/objc.h>
 

Index: src/OFHTTPRequest.h
==================================================================
--- src/OFHTTPRequest.h
+++ src/OFHTTPRequest.h
@@ -75,11 +75,10 @@
  */
 - (of_http_request_type_t)requestType;
 
 /**
  * Sets the query string for the HTTP request.
- * Only used for GET and HEAD requests!
  *
  * \param qs The query string for the HTTP request
  */
 - (void)setQueryString: (OFString*)qs;
 

Index: src/base64.m
==================================================================
--- src/base64.m
+++ src/base64.m
@@ -90,11 +90,11 @@
 }
 
 BOOL
 of_base64_decode(OFDataArray *data, const char *str, size_t len)
 {
-	uint8_t *buf = (uint8_t*)str;
+	const uint8_t *buf = (const uint8_t*)str;
 	size_t i;
 
 	if ((len & 3) != 0)
 		return NO;