diff -r 56ee9af6dcea config.mk
--- a/config.mk	Sat Nov 19 21:31:18 2011 +0100
+++ b/config.mk	Mon Nov 21 21:17:44 2011 +0100
@@ -17,7 +17,7 @@
 LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS}
 
 # flags
-CPPFLAGS = -D_BSD_SOURCE -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CPPFLAGS = -D_BSD_SOURCE -D_POSIX_SOURCE -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
 CFLAGS   = -ansi -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
 LDFLAGS  = -s ${LIBS}
 
diff -r 56ee9af6dcea dmenu.c
--- a/dmenu.c	Sat Nov 19 21:31:18 2011 +0100
+++ b/dmenu.c	Mon Nov 21 21:17:44 2011 +0100
@@ -55,6 +55,7 @@
 static Atom clip, utf8;
 static Bool topbar = True;
 static DC *dc;
+static FILE *incfp = NULL;
 static Item *items = NULL;
 static Item *matches, *matchend;
 static Item *prev, *curr, *next, *sel;
@@ -90,6 +91,8 @@
 			lines = atoi(argv[++i]);
 		else if(!strcmp(argv[i], "-p"))   /* adds prompt to left of input field */
 			prompt = argv[++i];
+		else if(!strcmp(argv[i], "-r"))   /* incremental output on given descriptor */
+			incfp = fdopen(atoi(argv[++i]), "w");
 		else if(!strcmp(argv[i], "-fn"))  /* font or font set */
 			font = argv[++i];
 		else if(!strcmp(argv[i], "-nb"))  /* normal background color */
@@ -388,6 +391,8 @@
 	size_t len;
 	Item *item, *lprefix, *lsubstr, *prefixend, *substrend;
 
+	if(incfp)
+		fprintf(incfp, "%s\n", text);
 	strcpy(buf, text);
 	/* separate input text into tokens to be matched individually */
 	for(s = strtok(buf, " "); s; tokv[tokc-1] = s, s = strtok(NULL, " "))
@@ -594,7 +599,7 @@
 
 void
 usage(void) {
-	fputs("usage: dmenu [-b] [-f] [-i] [-l lines] [-p prompt] [-fn font]\n"
+	fputs("usage: dmenu [-b] [-f] [-i] [-l lines] [-p prompt] [-r fd] [-fn font]\n"
 	      "             [-nb color] [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 	exit(EXIT_FAILURE);
 }