diff --git a/Makefile b/Makefile
index 4bcd3f8..818f1fc 100644
--- a/Makefile
+++ b/Makefile
@@ -43,20 +43,26 @@ PARAMS_SO = -fpic
 PARAMS_MISC = -Wno-unused-result
 FFTW_PACKAGE = fftw-3.3.3
 
-all: clean-vect
+.PHONY: clean-vect clean
+all: csdr ddcd
+libcsdr.so: fft_fftw.c fft_rpi.c libcsdr_wrapper.c libcsdr.c libcsdr_gpl.c
 	@echo NOTE: you may have to manually edit Makefile to optimize for your CPU \(especially if you compile on ARM, please edit PARAMS_NEON\).
 	@echo Auto-detected optimization parameters: $(PARAMS_SIMD)
 	@echo
+	rm -f dumpvect*.vect
 	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) $(LIBSOURCES) $(PARAMS_LIBS) $(PARAMS_MISC) -fpic -shared -o libcsdr.so
 	-./parsevect dumpvect*.vect
+csdr: csdr.c libcsdr.so
 	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) csdr.c $(PARAMS_LIBS) -L. -lcsdr $(PARAMS_MISC) -o csdr
+ddcd: ddcd.c libcsdr.so
+	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) ddcd.c $(PARAMS_LIBS) -L. -lcsdr $(PARAMS_MISC) -o ddcd
 arm-cross: clean-vect
 	#note: this doesn't work since having added FFTW
 	arm-linux-gnueabihf-gcc -std=gnu99 -O3 -fshort-double -ffast-math -dumpbase dumpvect-arm -fdump-tree-vect-details -mfloat-abi=softfp -march=armv7-a -mtune=cortex-a9 -mfpu=neon -mvectorize-with-neon-quad -Wno-unused-result -Wformat=0 $(SOURCES) -lm -o ./csdr
 clean-vect:
 	rm -f dumpvect*.vect
 clean: clean-vect
-	rm -f libcsdr.so csdr 
+	rm -f libcsdr.so csdr ddcd
 install: 
 	install -m 0755 libcsdr.so /usr/lib
 	install -m 0755 csdr /usr/bin
diff --git a/ddcd.c b/ddcd.c
index f93d1ce..5dd0bd1 100644
--- a/ddcd.c
+++ b/ddcd.c
@@ -31,8 +31,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <signal.h>
 #include <stdio.h>
 #include <getopt.h>
+#include <string.h>
+#include <stdlib.h>
 
-
+#define SOFTWARE_NAME "ddcd"
+#define MSG_START SOFTWARE_NAME ": "
 
 struct client_s
 {
@@ -40,16 +43,16 @@ struct client_s
 	int addr;
 } client_t;
 
-
+int host_port = 0;
+char host_address[100] = "127.0.0.1";
+int decimation = 0;
 
 int main(int argc, char* argv[])
 {
 	int c;
 	
 	//arguments:
-	int host_port;
-	char host_address[100] = "127.0.0.1";
-	int decimation;
+
 
 	for(;;)
 	{
@@ -75,16 +78,16 @@ int main(int argc, char* argv[])
 			break;
 		case 0:
 		case '?':
+		case ':':
 		default:
 			printf(" 0%o ??\n", c);
 		}
-
-
-		
-		
 	}
-
-	struct sockaddr_in addr_host;
+	
+	if(!decimation) { fprintf(stderr, MSG_START "missing required command line argument, --decimation.\n"); exit(1); }
+	if(!host_port) { fprintf(stderr, MSG_START "missing required command line argument, --port.\n"); exit(1); }
+	
+	/*struct sockaddr_in addr_host;
     int listen_socket;
 	std::vector<client_t> clients;
     listen_socket=socket(AF_INET,SOCK_STREAM,0);
@@ -92,5 +95,6 @@ int main(int argc, char* argv[])
     addr_host.sin_family=AF_INET;
     addr_host.sin_port=htons(8888);
     addr_host.sin_addr.s_addr=inet_addr("127.0.0.1");	
+	*/
 	
 }