Index: src/prelude/Makefile.am
===================================================================
--- src/prelude/Makefile.am	(revision 56fba87fa2915c888a9863790048809b4e04e114)
+++ src/prelude/Makefile.am	(revision 4934ea346862de29c799c6cf0d5cba87561e39ea)
@@ -23,5 +23,5 @@
 noinst_DATA = ../libcfa/libcfa-prelude.c
 
-CC = ${abs_top_srcdir}/src/driver/cfa
+CC = ${abs_top_builddir}/src/driver/cfa
 
 $(DEPDIR) :
@@ -32,13 +32,13 @@
 
 # create extra forward types/declarations to reduce inclusion of library files
-extras.cf : extras.regx extras.c
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E ${srcdir}/extras.c | grep -f extras.regx > ${srcdir}/extras.cf
+extras.cf : ${srcdir}/extras.regx ${srcdir}/extras.c
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E ${srcdir}/extras.c | grep -f ${srcdir}/extras.regx > extras.cf
 
 # create forward declarations for gcc builtins
-gcc-builtins.cf : gcc-builtins.c prototypes.sed
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E -P $< | sed -r -f prototypes.sed > $@
+gcc-builtins.cf : gcc-builtins.c ${srcdir}/prototypes.sed
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -I${srcdir} -E -P $< | sed -r -f ${srcdir}/prototypes.sed > $@
 
-gcc-builtins.c : builtins.def prototypes.awk sync-builtins.cf
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E prototypes.c | awk -f prototypes.awk > $@
+gcc-builtins.c : ${srcdir}/builtins.def ${srcdir}/prototypes.awk ${srcdir}/sync-builtins.cf ${srcdir}/prototypes.c
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -I${srcdir} -E ${srcdir}/prototypes.c | awk -f ${srcdir}/prototypes.awk > $@
 
 prelude.cf : prelude-gen.cc
@@ -58,9 +58,9 @@
 include $(DEPDIR)/builtins.Po
 
-../libcfa/libcfa-prelude.c : prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_srcdir}/src/driver/cfa-cpp
-	${AM_V_GEN}${abs_top_srcdir}/src/driver/cfa-cpp -l prelude.cf $@  # use src/cfa-cpp as not in lib until after install
+../libcfa/libcfa-prelude.c : prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_builddir}/src/driver/cfa-cpp
+	${AM_V_GEN}${abs_top_builddir}/src/driver/cfa-cpp -l prelude.cf $@  # use src/cfa-cpp as not in lib until after install
 
-bootloader.c : bootloader.cf prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_srcdir}/src/driver/cfa-cpp
-	${AM_V_GEN}${abs_top_srcdir}/src/driver/cfa-cpp -tpm bootloader.cf $@  # use src/cfa-cpp as not in lib until after install
+bootloader.c : ${srcdir}/bootloader.cf prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_builddir}/src/driver/cfa-cpp
+	${AM_V_GEN}${abs_top_builddir}/src/driver/cfa-cpp -tpm ${srcdir}/bootloader.cf $@  # use src/cfa-cpp as not in lib until after install
 
 maintainer-clean-local :
Index: src/prelude/Makefile.in
===================================================================
--- src/prelude/Makefile.in	(revision 56fba87fa2915c888a9863790048809b4e04e114)
+++ src/prelude/Makefile.in	(revision 4934ea346862de29c799c6cf0d5cba87561e39ea)
@@ -162,5 +162,5 @@
 AWK = @AWK@
 BACKEND_CC = @BACKEND_CC@
-CC = ${abs_top_srcdir}/src/driver/cfa
+CC = ${abs_top_builddir}/src/driver/cfa
 CCAS = @CCAS@
 CCASDEPMODE = @CCASDEPMODE@
@@ -501,13 +501,13 @@
 
 # create extra forward types/declarations to reduce inclusion of library files
-extras.cf : extras.regx extras.c
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E ${srcdir}/extras.c | grep -f extras.regx > ${srcdir}/extras.cf
+extras.cf : ${srcdir}/extras.regx ${srcdir}/extras.c
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E ${srcdir}/extras.c | grep -f ${srcdir}/extras.regx > extras.cf
 
 # create forward declarations for gcc builtins
-gcc-builtins.cf : gcc-builtins.c prototypes.sed
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E -P $< | sed -r -f prototypes.sed > $@
-
-gcc-builtins.c : builtins.def prototypes.awk sync-builtins.cf
-	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -E prototypes.c | awk -f prototypes.awk > $@
+gcc-builtins.cf : gcc-builtins.c ${srcdir}/prototypes.sed
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -I${srcdir} -E -P $< | sed -r -f ${srcdir}/prototypes.sed > $@
+
+gcc-builtins.c : ${srcdir}/builtins.def ${srcdir}/prototypes.awk ${srcdir}/sync-builtins.cf ${srcdir}/prototypes.c
+	${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -I${srcdir} -E ${srcdir}/prototypes.c | awk -f ${srcdir}/prototypes.awk > $@
 
 prelude.cf : prelude-gen.cc
@@ -527,9 +527,9 @@
 include $(DEPDIR)/builtins.Po
 
-../libcfa/libcfa-prelude.c : prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_srcdir}/src/driver/cfa-cpp
-	${AM_V_GEN}${abs_top_srcdir}/src/driver/cfa-cpp -l prelude.cf $@  # use src/cfa-cpp as not in lib until after install
-
-bootloader.c : bootloader.cf prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_srcdir}/src/driver/cfa-cpp
-	${AM_V_GEN}${abs_top_srcdir}/src/driver/cfa-cpp -tpm bootloader.cf $@  # use src/cfa-cpp as not in lib until after install
+../libcfa/libcfa-prelude.c : prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_builddir}/src/driver/cfa-cpp
+	${AM_V_GEN}${abs_top_builddir}/src/driver/cfa-cpp -l prelude.cf $@  # use src/cfa-cpp as not in lib until after install
+
+bootloader.c : ${srcdir}/bootloader.cf prelude.cf extras.cf gcc-builtins.cf builtins.cf ${abs_top_builddir}/src/driver/cfa-cpp
+	${AM_V_GEN}${abs_top_builddir}/src/driver/cfa-cpp -tpm ${srcdir}/bootloader.cf $@  # use src/cfa-cpp as not in lib until after install
 
 maintainer-clean-local :