Move config.mk into Makefile, and delete config.mk.

config.mk shall now contain user-specific configurations, and thus is
now ignored.

.gitignore

@@ -12,6 +12,7 @@
 
 # Ignore /bin/ directory
 /bin/
+/config.mk
 
 # Unignore specific files.
 !.gitignore

Makefile

@@ -1,12 +1,30 @@
 # dwm - dynamic window manager
 # See LICENSE file for copyright and license details.
 
-include config.mk
+-include config.mk
+
+VERSION = 6.7
 
 INSTALL ?= install
 GZIP    ?= gzip
 TAR     ?= tar
 
+CFLAGS   := -Os $(CFLAGS) -g -std=gnu99\
+	    -Wall -Wextra -Wpedantic -Wno-pointer-arith
+CPPFLAGS := -DNDEBUG $(CPPFLAGS)\
+	    -DVERSION=\"$(VERSION)\" -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=700L -DXINERAMA
+LDFLAGS  := -flto $(LDFLAGS)
+LDLIBS   := $(LDLIBS) -lm
+
+# Use pkg-config to locate dependencies, and set the correct flags.
+ifeq (,$(shell command -v pkg-config))
+$(error Failed to locate pkg-config, please make sure it is installed or acessible through PATH.)
+else
+CPPFLAGS += $(shell pkg-config --cflags-only-I x11 xinerama)
+LDFLAGS  += $(shell pkg-config --libs-only-L   x11 xinerama)
+LDLIBS   += $(shell pkg-config --libs-only-l   x11 xinerama)
+endif
+
 SRC := $(wildcard src/*.c)
 OBJ := $(addsuffix .o,$(SRC))
 DEP := $(addsuffix .d,$(SRC))

config.mk

@@ -1,39 +0,0 @@
-# dwm version
-VERSION = 6.7
-
-# Customize below to fit your system
-
-# paths
-PREFIX = /usr/local
-MANPREFIX = ${PREFIX}/share/man
-
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
-
-# Xinerama, comment if you don't want it
-XINERAMALIBS  = -lXinerama
-XINERAMAFLAGS = -DXINERAMA
-
-# freetype
-FREETYPELIBS = -lfontconfig -lXft
-FREETYPEINC = /usr/include/freetype2
-# OpenBSD (uncomment)
-#FREETYPEINC = ${X11INC}/freetype2
-#MANPREFIX = ${PREFIX}/man
-
-# includes and libs
-INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
-
-# flags
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
-#CFLAGS   = -g -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
-CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = ${LIBS}
-
-# Solaris
-#CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
-#LDFLAGS = ${LIBS}
-
-# compiler and linker
-CC = cc