Index: src/Makefile
==================================================================
--- src/Makefile
+++ src/Makefile
@@ -88,11 +88,11 @@
        OFString+PropertyListParsing.m	\
        OFString+Serialization.m		\
        OFString+URLEncoding.m		\
        OFString+XMLEscaping.m		\
        OFString+XMLUnescaping.m		\
-       ${OF_SUBUPROCESS_M}		\
+       ${OF_SUBPROCESS_M}		\
        OFSystemInfo.m			\
        OFTarArchive.m			\
        OFTarArchiveEntry.m		\
        OFThread.m			\
        OFTimer.m			\

Index: src/OFSubprocess.h
==================================================================
--- src/OFSubprocess.h
+++ src/OFSubprocess.h
@@ -78,11 +78,11 @@
  *		  search path specified in PATH is used.
  * @param arguments The arguments to pass to the program, or `nil`
  * @return A new, autoreleased OFSubprocess.
  */
 + (instancetype)
-    subProcessWithProgram: (OFString *)program
+    subprocessWithProgram: (OFString *)program
 		arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments;
 
 /**
  * @brief Creates a new OFSubprocess with the specified program, program name
  *	  and arguments and invokes the program.

Index: src/objfw-defs.h.in
==================================================================
--- src/objfw-defs.h.in
+++ src/objfw-defs.h.in
@@ -22,11 +22,11 @@
 #undef OF_HAVE_OSATOMIC
 #undef OF_HAVE_OSATOMIC_64
 #undef OF_HAVE_PIPE
 #undef OF_HAVE_PLEDGE
 #undef OF_HAVE_PLUGINS
-#undef OF_HAVE_PROCESSES
+#undef OF_HAVE_SUBPROCESSES
 #undef OF_HAVE_PTHREADS
 #undef OF_HAVE_PTHREAD_SPINLOCKS
 #undef OF_HAVE_RECURSIVE_PTHREAD_MUTEXES
 #undef OF_HAVE_SCHED_YIELD
 #undef OF_HAVE_SOCKETS

Index: src/platform/POSIX/OFSubprocess.m
==================================================================
--- src/platform/POSIX/OFSubprocess.m
+++ src/platform/POSIX/OFSubprocess.m
@@ -207,12 +207,13 @@
 
 			close(_readPipe[1]);
 			close(_writePipe[0]);
 			OFFreeMemory(argv);
 
-			for (iter = env; *iter != NULL; iter++)
-				OFFreeMemory(*iter);
+			if (env != NULL)
+				for (iter = env; *iter != NULL; iter++)
+					OFFreeMemory(*iter);
 
 			OFFreeMemory(env);
 		}
 
 		objc_autoreleasePoolPop(pool);