diff --git a/Makefile b/Makefile
index 85a2dc8e..b0a3e27a 100644
--- a/Makefile
+++ b/Makefile
@@ -14,8 +14,10 @@ SUBS = \
   perl/Makefile \
   scripts/Makefile \
   corepkgs/Makefile \
-  tests/Makefile
+  tests/Makefile \
 
 GLOBAL_CXXFLAGS = -I . -I src -I src/libutil -I src/libstore -I src/libmain -I src/libexpr
 
+include Makefile.config
+
 include mk/lib.mk
diff --git a/perl/Makefile b/perl/Makefile
index a0788e2a..8171d194 100644
--- a/perl/Makefile
+++ b/perl/Makefile
@@ -20,7 +20,7 @@ ifeq ($(perlbindings), yes)
 
   Store_DIR := $(d)/lib/Nix
 
-  Store_SOURCES = Store.cc
+  Store_SOURCES := $(Store_DIR)/Store.cc
 
   Store_LIBS = libstore
 
diff --git a/src/boost/Makefile.am b/src/boost/Makefile.am
deleted file mode 100644
index 8b5aa25f..00000000
--- a/src/boost/Makefile.am
+++ /dev/null
@@ -1,8 +0,0 @@
-SUBDIRS = format
-
-nobase_pkginclude_HEADERS = assert.hpp checked_delete.hpp format.hpp \
- shared_ptr.hpp weak_ptr.hpp throw_exception.hpp \
- enable_shared_from_this.hpp \
- detail/shared_count.hpp detail/workaround.hpp
-
-pkgincludedir = ${includedir}/nix/boost
diff --git a/src/boost/format/Makefile b/src/boost/format/Makefile
index b60a2ea4..17897fa5 100644
--- a/src/boost/format/Makefile
+++ b/src/boost/format/Makefile
@@ -4,4 +4,4 @@ libformat_NAME = libnixformat
 
 libformat_DIR := $(d)
 
-libformat_SOURCES = format_implementation.cc free_funcs.cc parsing.cc
+libformat_SOURCES := $(wildcard $(d)/*.cc)
diff --git a/src/bsdiff-4.3/Makefile b/src/bsdiff-4.3/Makefile
index c0d74e0c..aca1ac11 100644
--- a/src/bsdiff-4.3/Makefile
+++ b/src/bsdiff-4.3/Makefile
@@ -1,12 +1,12 @@
 PROGRAMS += bsdiff bspatch
 
 bsdiff_DIR := $(d)
-bsdiff_SOURCES = bsdiff.c
+bsdiff_SOURCES := $(d)/bsdiff.c
 bsdiff_LDFLAGS = -lbz2 $(bsddiff_compat_include)
 bsdiff_INSTALL_DIR = $(libexecdir)/nix
 
 bspatch_DIR := $(d)
-bspatch_SOURCES = bspatch.c
+bspatch_SOURCES := $(d)/bspatch.c
 bspatch_LDFLAGS = -lbz2 $(bsddiff_compat_include)
 bspatch_INSTALL_DIR = $(libexecdir)/nix
 
diff --git a/src/libexpr/Makefile b/src/libexpr/Makefile
index c6ed7d14..de276aa6 100644
--- a/src/libexpr/Makefile
+++ b/src/libexpr/Makefile
@@ -4,10 +4,7 @@ libexpr_NAME = libnixexpr
 
 libexpr_DIR := $(d)
 
-libexpr_SOURCES = \
-  nixexpr.cc eval.cc primops.cc lexer-tab.cc parser-tab.cc \
-  get-drvs.cc attr-path.cc value-to-xml.cc value-to-json.cc \
-  common-opts.cc names.cc
+libexpr_SOURCES := $(wildcard $(d)/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc
 
 libexpr_LIBS = libutil libstore libformat
 
diff --git a/src/libmain/Makefile b/src/libmain/Makefile
index 7312b8d2..0efeee53 100644
--- a/src/libmain/Makefile
+++ b/src/libmain/Makefile
@@ -4,7 +4,7 @@ libmain_NAME = libnixmain
 
 libmain_DIR := $(d)
 
-libmain_SOURCES = shared.cc stack.cc
+libmain_SOURCES := $(wildcard $(d)/*.cc)
 
 libmain_LIBS = libstore libutil libformat
 
diff --git a/src/libstore/Makefile b/src/libstore/Makefile
index eaba1005..83c5d8ed 100644
--- a/src/libstore/Makefile
+++ b/src/libstore/Makefile
@@ -4,9 +4,7 @@ libstore_NAME = libnixstore
 
 libstore_DIR := $(d)
 
-libstore_SOURCES = \
-  store-api.cc local-store.cc remote-store.cc derivations.cc build.cc misc.cc \
-  globals.cc references.cc pathlocks.cc gc.cc optimise-store.cc
+libstore_SOURCES := $(wildcard $(d)/*.cc)
 
 libstore_LIBS = libutil libformat
 
diff --git a/src/libutil/Makefile b/src/libutil/Makefile
index b604c007..83bd05f2 100644
--- a/src/libutil/Makefile
+++ b/src/libutil/Makefile
@@ -4,12 +4,12 @@ libutil_NAME = libnixutil
 
 libutil_DIR := $(d)
 
-libutil_SOURCES = util.cc hash.cc serialise.cc archive.cc xml-writer.cc affinity.cc
+libutil_SOURCES := $(wildcard $(d)/*.cc)
 
 ifeq ($(HAVE_OPENSSL), 1)
   libutil_LDFLAGS = $(OPENSSL_LIBS)
 else
-  libutil_SOURCES += md5.c sha1.c sha256.c
+  libutil_SOURCES += $(d)/md5.c $(d)/sha1.c $(d)/sha256.c
 endif
 
 libutil_LIBS = libformat
diff --git a/src/nix-daemon/Makefile b/src/nix-daemon/Makefile
index 2a8a7d92..f6bc9ea3 100644
--- a/src/nix-daemon/Makefile
+++ b/src/nix-daemon/Makefile
@@ -2,6 +2,6 @@ PROGRAMS += nix-daemon
 
 nix-daemon_DIR := $(d)
 
-nix-daemon_SOURCES = nix-daemon.cc
+nix-daemon_SOURCES := $(d)/nix-daemon.cc
 
 nix-daemon_LIBS = libmain libstore libutil libformat
diff --git a/src/nix-env/Makefile b/src/nix-env/Makefile
index 04545231..5a38d2fb 100644
--- a/src/nix-env/Makefile
+++ b/src/nix-env/Makefile
@@ -2,6 +2,6 @@ PROGRAMS += nix-env
 
 nix-env_DIR := $(d)
 
-nix-env_SOURCES = nix-env.cc profiles.cc user-env.cc
+nix-env_SOURCES := $(wildcard $(d)/*.cc)
 
 nix-env_LIBS = libexpr libmain libstore libutil libformat
diff --git a/src/nix-hash/Makefile b/src/nix-hash/Makefile
index 462cd78d..062e4d13 100644
--- a/src/nix-hash/Makefile
+++ b/src/nix-hash/Makefile
@@ -2,6 +2,6 @@ PROGRAMS += nix-hash
 
 nix-hash_DIR := $(d)
 
-nix-hash_SOURCES = nix-hash.cc
+nix-hash_SOURCES := $(d)/nix-hash.cc
 
 nix-hash_LIBS = libmain libstore libutil libformat
diff --git a/src/nix-instantiate/Makefile b/src/nix-instantiate/Makefile
index 9c4cfec2..daa741eb 100644
--- a/src/nix-instantiate/Makefile
+++ b/src/nix-instantiate/Makefile
@@ -2,6 +2,6 @@ PROGRAMS += nix-instantiate
 
 nix-instantiate_DIR := $(d)
 
-nix-instantiate_SOURCES = nix-instantiate.cc
+nix-instantiate_SOURCES := $(d)/nix-instantiate.cc
 
 nix-instantiate_LIBS = libexpr libmain libstore libutil libformat
diff --git a/src/nix-log2xml/Makefile b/src/nix-log2xml/Makefile
index 8b02dca7..8467d197 100644
--- a/src/nix-log2xml/Makefile
+++ b/src/nix-log2xml/Makefile
@@ -2,7 +2,7 @@ PROGRAMS += nix-log2xml
 
 nix-log2xml_DIR := $(d)
 
-nix-log2xml_SOURCES = log2xml.cc
+nix-log2xml_SOURCES := $(d)/log2xml.cc
 
 $(foreach file, mark-errors.xsl log2html.xsl treebits.js, \
   $(eval $(call install-data-in, $(d)/$(file), $(datadir)/nix/log2html)))
diff --git a/src/nix-store/Makefile b/src/nix-store/Makefile
index 10551387..edd111b4 100644
--- a/src/nix-store/Makefile
+++ b/src/nix-store/Makefile
@@ -2,7 +2,7 @@ PROGRAMS += nix-store
 
 nix-store_DIR := $(d)
 
-nix-store_SOURCES = nix-store.cc dotgraph.cc xmlgraph.cc
+nix-store_SOURCES := $(wildcard $(d)/*.cc)
 
 nix-store_LIBS = libmain libstore libutil libformat