print LDFLAGS and add -s only if SFLAGS is not set

Makefile

@@ -13,6 +13,7 @@ all: options ${PROJECT}
 options:
 	@echo ${PROJECT} build options:
 	@echo "CFLAGS  = ${CFLAGS}"
+	@echo "LDFLAGS = ${LDFLAGS}"
 	@echo "LIBS    = ${LIBS}"
 	@echo "DFLAGS  = ${DFLAGS}"
 	@echo "CC      = ${CC}"

config.mk

@@ -14,14 +14,17 @@ GTK_LIB = $(shell pkg-config --libs gtk+-2.0 gthread-2.0 poppler-glib)
 INCS = -I. -I/usr/include ${GTK_INC}
 LIBS = -lc ${GTK_LIB} -lpthread -lm
 
-# flags
+# compiler flags
 CFLAGS += -std=c99 -pedantic -Wall -Wno-format-zero-length $(INCS)
 
-# debug
+# debug flags
 DFLAGS = -g
 
+# linker flags
+LDFLAGS ?=
+
 # compiler
 CC ?= gcc
 
 # strip
-SFLAGS = -s
+SFLAGS ?= -s