Rework use of pkg-config to work around librtlsdr packaging bugs in u…

…buntu disco

Makefile

@@ -15,16 +15,20 @@ ifeq ($(RTLSDR), yes)
 
  ifdef RTLSDR_PREFIX
  CPPFLAGS += -I$(RTLSDR_PREFIX)/include
- LDFLAGS += -L$(RTLSDR_PREFIX)/lib
+ ifeq ($(STATIC), yes)
+ LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -Wl,-Bstatic -lrtlsdr -Wl,-Bdynamic -lusb-1.0
+ else
+ LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -lrtlsdr -lusb-1.0
+ endif
  else
  CFLAGS += $(shell pkg-config --cflags librtlsdr)
- LDFLAGS += $(shell pkg-config --libs-only-L librtlsdr)
- endif
-
- ifeq ($(STATIC), yes)
- LIBS_SDR += -Wl,-Bstatic -lrtlsdr -Wl,-Bdynamic -lusb-1.0
- else
- LIBS_SDR += -lrtlsdr -lusb-1.0
+ # some packaged .pc files are massively broken, try to handle it
+  RTLSDR_LFLAGS := $(shell pkg-config --libs-only-L librtlsdr)
+ ifeq ($(RTLSDR_LFLAGS),-L)
+  LIBS_SDR += $(shell pkg-config --libs-only-l --libs-only-other librtlsdr)
+ else
+  LIBS_SDR += $(shell pkg-config --libs librtlsdr)
+ endif
  endif
 endif