@@ -225,11 +225,11 @@
 		])
 	])
 ])
 AC_MSG_RESULT($objc_runtime)
 
-case $objc_runtime in
+case "$objc_runtime" in
 	"ObjFW runtime")
 		AC_DEFINE(OF_OBJFW_RUNTIME, 1,
 			[Whether we use the ObjFW runtime])
 
 		AC_MSG_CHECKING([whether -fobjc-runtime=objfw is supported])
@@ -308,11 +308,11 @@
 			AS_IF([$EGREP __gnu_objc_personality_seh0 \
 					conftest.$ac_objext >/dev/null], [
 				exception_type="SEH"
 			])
 
-			case $exception_type in
+			case "$exception_type" in
 			DWARF)
 				AC_DEFINE(HAVE_DWARF_EXCEPTIONS, 1,
 					[Whether DWARF exceptions are used])
 				;;
 			SjLj)
@@ -525,11 +525,11 @@
 		AC_MSG_CHECKING(for threads)
 		AC_MSG_RESULT(WinAPI)
 		;;
 	*)
 		ACX_PTHREAD([
-			CPPLAGS="$CPPFLAGS $PTHREAD_CFLAGS"
+			CPPFLAGS="$CPPFLAGS $PTHREAD_CFLAGS"
 			LIBS="$LIBS $PTHREAD_LIBS"
 			AC_DEFINE(OF_HAVE_PTHREADS, 1,
 				[Whether we have pthreads])
 
 			AC_TRY_COMPILE([