Enable LDFLAGS flag override

In case of the project cross-compilation, dependent libraries
(libcrypt) are located outside of the default library locations.

examples/Gertboard/Makefile

@@ -15,7 +15,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # Should not alter anything below this line

examples/Makefile

@@ -32,7 +32,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm -lcrypt -lrt
 
 # Should not alter anything below this line

examples/PiFace/Makefile

@@ -32,7 +32,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # Should not alter anything below this line

examples/PiGlow/Makefile

@@ -32,7 +32,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # Should not alter anything below this line

examples/q2w/Makefile

@@ -32,7 +32,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 ###############################################################################

examples/scrollPhat/Makefile

@@ -32,7 +32,7 @@ CC	?= gcc
 INCLUDE	= -I/usr/local/include
 CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L/usr/local/lib
+LDFLAGS	?= -L/usr/local/lib
 LDLIBS    = -lwiringPi -lwiringPiDev -lpthread -lm
 
 # Should not alter anything below this line

gpio/Makefile

@@ -36,7 +36,7 @@ CC	?= gcc
 INCLUDE	= -I$(DESTDIR)$(PREFIX)/include
 CFLAGS	= $(DEBUG) -Wall -Wextra $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L$(DESTDIR)$(PREFIX)/lib
+LDFLAGS	?= -L$(DESTDIR)$(PREFIX)/lib
 LIBS    = -lwiringPi -lwiringPiDev -lpthread -lrt -lm -lcrypt
 
 # May not need to  alter anything below this line

wiringPi/Makefile

@@ -42,6 +42,7 @@ DEFS	= -D_GNU_SOURCE
 CFLAGS	= $(DEBUG) $(DEFS) -Wformat=2 -Wall -Wextra -Winline $(INCLUDE) -pipe -fPIC $(EXTRA_CFLAGS)
 #CFLAGS	= $(DEBUG) $(DEFS) -Wformat=2 -Wall -Wextra -Wconversion -Winline $(INCLUDE) -pipe -fPIC
 
+LDFLAGS	?= -L/usr/local/lib
 LIBS    = -lm -lpthread -lrt -lcrypt
 
 ###############################################################################
@@ -75,7 +76,7 @@ static:
 
 $(DYNAMIC):	$(OBJ)
 	$Q echo "[Link (Dynamic)]"
-	$Q $(CC) -shared -Wl,-soname,libwiringPi.so$(WIRINGPI_SONAME_SUFFIX) -o libwiringPi.so.$(VERSION) $(OBJ) $(LIBS)
+	$Q $(CC) -shared -Wl,-soname,libwiringPi.so$(WIRINGPI_SONAME_SUFFIX) -o libwiringPi.so.$(VERSION) $(OBJ) $(LDFLAGS) $(LIBS)
 
 .c.o:
 	$Q echo [Compile] $<

wiringPiD/Makefile

@@ -35,7 +35,7 @@ CC	?= gcc
 INCLUDE	= -I$(DESTDIR)$(PREFIX)/include
 CFLAGS	= $(DEBUG) -Wall -Wextra $(INCLUDE) -Winline -pipe $(EXTRA_CFLAGS)
 
-LDFLAGS	= -L$(DESTDIR)$(PREFIX)/lib
+LDFLAGS	?= -L$(DESTDIR)$(PREFIX)/lib
 LIBS    = -lwiringPi -lwiringPiDev -lpthread -lrt -lm -lcrypt
 
 # May not need to  alter anything below this line