diff --git a/Makefile b/Makefile
index a598b6a..94b41e3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+topdir          :=$(dir $(realpath $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))))
+
 CC              ?=cc
 CFLAGS          ?=-O2 -g
 
@@ -11,35 +13,35 @@ datadir         ?=$(datarootdir)
 docdir          ?=$(datarootdir)/doc/musl-compat-$(VERSION)
 mandir          ?=$(datarootdir)/man
 
-BINS            := $(notdir $(basename $(wildcard bin/*.c)))
-BINS_SH         := $(notdir $(basename $(basename $(wildcard bin/*.sh.in))))
-INCLUDES        := $(shell find include/ -type f -name '*.h')
-INCLUDES        := $(INCLUDES:include/%=%)
-LIBS            := $(notdir $(wildcard lib/*.a))
+BINS            := $(notdir $(basename $(wildcard $(topdir)/bin/*.c)))
+BINS_SH         := $(notdir $(basename $(basename $(wildcard $(topdir)/bin/*.sh.in))))
+INCLUDES        := $(shell find "$(topdir)/include" -type f -name '*.h')
+INCLUDES        := $(INCLUDES:$(topdir)/include/%=%)
+LIBS            := $(notdir $(wildcard $(topdir)/lib/*.a))
 
 VERSION         =4
 
-build:	$(foreach b,$(BINS),bin/$(b).o) $(foreach b,$(BINS_SH),bin/$(b).sh)
+build:	$(foreach b,$(BINS),$(topdir)/bin/$(b).o) $(foreach b,$(BINS_SH),$(topdir)/bin/$(b).sh)
 
-bin/%.sh: bin/%.sh.in
-	cp $< $@
+$(topdir)/bin/%.sh: $(topdir)/bin/%.sh.in
+	cp "$<" "$@"
 	chmod +x "$@"
 
-bin/%.o: bin/%.c
-	$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
+$(topdir)/bin/%.o: $(topdir)/bin/%.c
+	$(CC) -I"$(topdir)/include" $(CFLAGS) $(LDFLAGS) "$<" -o "$@"
 
-$(DESTDIR)$(bindir)/%: bin/$(notdir %)
-	install -D -m 755 $< $(basename $@)
+$(DESTDIR)$(bindir)/%: $(topdir)/bin/$(notdir %)
+	install -D -m 755 "$<" "$(basename $@)"
 
-$(DESTDIR)$(includedir)/%: include/$(notdir %)
-	install -D -m 644 $< $@
+$(DESTDIR)$(includedir)/%: $(topdir)/include/$(notdir %)
+	install -D -m 644 "$<" "$@"
 
-$(DESTDIR)$(libdir)/%: lib/$(notdir %)
-	install -D -m 755 $< $@
+$(DESTDIR)$(libdir)/%: $(topdir)/lib/$(notdir %)
+	install -D -m 755 "$<" "$@"
 
-install: build $(foreach b,$(BINS),$(DESTDIR)$(bindir)/$(b).o) $(foreach b,$(BINS_SH),$(DESTDIR)$(bindir)/$(b).sh) $(foreach i,$(INCLUDES),$(DESTDIR)$(includedir)/$(i)) $(foreach l,$(LIBS),$(DESTDIR)$(libdir)/$(l))
+install: $(foreach b,$(BINS),$(DESTDIR)$(bindir)/$(b).o) $(foreach b,$(BINS_SH),$(DESTDIR)$(bindir)/$(b).sh) $(foreach i,$(INCLUDES),$(DESTDIR)$(includedir)/$(i)) $(foreach l,$(LIBS),$(DESTDIR)$(libdir)/$(l))
 
 clean:
-	rm -rf $(foreach b,$(BINS),bin/$(b).o) $(foreach b,$(BINS_SH),bin/$(b).sh)
+	rm -rf $(foreach b,$(BINS),$(topdir)/bin/$(b).o) $(foreach b,$(BINS_SH),$(topdir)/bin/$(b).sh)
 
 .PHONY:	all build clean install