Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -693,10 +693,33 @@
 ])
 
 AS_IF([test x"$enable_sockets" != x"no" -a x"$enable_threads" != x"no"], [
 	AC_SUBST(OFHTTPCLIENTTESTS_M, "OFHTTPClientTests.m")
 ])
+
+case "$host" in
+	*-*-mingw*)
+		have_processes="yes"
+		;;
+	*)
+		AC_CHECK_FUNCS([fork pipe dup2 execvp kill], [
+			if test x"$ac_cv_func_fork" = x"yes" \
+			    -a x"$ac_cv_func_pipe" = x"yes" \
+			    -a x"$ac_cv_func_dup2" = x"yes" \
+			    -a x"$ac_cv_func_execvp" = x"yes" \
+			    -a x"$ac_cv_func_kill" = x"yes"; then
+				have_processes="yes"
+			fi
+		], [
+			break
+		])
+		;;
+esac
+AS_IF([test x"$have_processes" = x"yes"], [
+	AC_SUBST(OFPROCESS_M, "OFProcess.m")
+	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
+])
 
 AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
 	AC_CHECK_HEADER(Foundation/NSObject.h, [
 		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
 		AC_SUBST(BRIDGE, "bridge")

Index: extra.mk.in
==================================================================
--- extra.mk.in
+++ extra.mk.in
@@ -22,10 +22,11 @@
 FOUNDATION_COMPAT_M = @FOUNDATION_COMPAT_M@
 INSTANCE_M = @INSTANCE_M@
 LOOKUP_S = @LOOKUP_S@
 OFBLOCKTESTS_M = @OFBLOCKTESTS_M@
 OFHTTPCLIENTTESTS_M = @OFHTTPCLIENTTESTS_M@
+OFPROCESS_M = @OFPROCESS_M@
 OFSTREAMOBSERVER_KQUEUE_M = @OFSTREAMOBSERVER_KQUEUE_M@
 OFSTREAMOBSERVER_POLL_M = @OFSTREAMOBSERVER_POLL_M@
 OFSTREAMOBSERVER_SELECT_M = @OFSTREAMOBSERVER_SELECT_M@
 PROPERTIESTESTS_M = @PROPERTIESTESTS_M@
 REEXPORT_LIBOBJC = @REEXPORT_LIBOBJC@

Index: src/Makefile
==================================================================
--- src/Makefile
+++ src/Makefile
@@ -31,11 +31,11 @@
        OFMutableString.m		\
        OFNull.m				\
        OFNumber.m			\
        OFObject.m			\
        OFObject+Serialization.m		\
-       OFProcess.m			\
+       ${OFPROCESS_M}			\
        OFRunLoop.m			\
        OFSeekableStream.m		\
        OFSet.m				\
        OFSHA1Hash.m			\
        OFSortedList.m			\

Index: src/ObjFW.h
==================================================================
--- src/ObjFW.h
+++ src/ObjFW.h
@@ -56,11 +56,13 @@
 # import "OFHTTPRequestReply.h"
 # import "OFHTTPClient.h"
 # import "OFHTTPServer.h"
 #endif
 
-#import "OFProcess.h"
+#ifdef OF_HAVE_PROCESSES
+# import "OFProcess.h"
+#endif
 
 #import "OFHash.h"
 #import "OFMD5Hash.h"
 #import "OFSHA1Hash.h"
 

Index: src/objfw-defs.h.in
==================================================================
--- src/objfw-defs.h.in
+++ src/objfw-defs.h.in
@@ -8,12 +8,13 @@
 #undef OF_HAVE_GCC_ATOMIC_OPS
 #undef OF_HAVE_OSATOMIC
 #undef OF_HAVE_OSATOMIC_64
 #undef OF_HAVE_PTHREADS
 #undef OF_HAVE_PLUGINS
+#undef OF_HAVE_PROCESSES
 #undef OF_HAVE_PTHREAD_SPINLOCKS
 #undef OF_HAVE_RECURSIVE_PTHREAD_MUTEXES
 #undef OF_HAVE_SCHED_YIELD
 #undef OF_HAVE_SOCKETS
 #undef OF_HAVE_THREADS
 #undef OF_OBJFW_RUNTIME
 #undef SIZE_MAX