diff -ruN Firebird-3.0.2.32703-0.orig/builds/posix/Makefile.in Firebird-3.0.2.32703-0/builds/posix/Makefile.in
--- Firebird-3.0.2.32703-0.orig/builds/posix/Makefile.in	2017-03-21 10:11:35.000000000 +0100
+++ Firebird-3.0.2.32703-0/builds/posix/Makefile.in	2017-05-14 01:32:34.032241679 +0200
@@ -123,7 +123,6 @@
 #
 
 extern:
-	$(MAKE) -C $(ROOT)/extern/btyacc
 	$(MAKE) -C $(ROOT)/extern/cloop TARGET=release WITH_FPC=0 BUILD_DIR=$(TMP_ROOT)/cloop OUT_DIR=$(GEN_ROOT)/$(TARGET)/cloop
 
 ifeq ($(TOMBUILD_FLG),Y)
@@ -648,7 +647,7 @@
 # various cleaning
 #
 .PHONY: clean clean_objects clean_dependancies clean_extern_objects clean_build \
-		clean_gpre_gen clean_icu clean_dbs clean_examples clean_makefiles \
+		clean_gpre_gen clean_dbs clean_examples clean_makefiles \
 		clean_editline clean_all
 
 
@@ -669,8 +668,6 @@
 	$(RM) $(ROOT)/libtool
 	$(RM_R) $(ROOT)/autom4te.cache
 	-$(MAKE) -C $(ROOT)/extern/editline distclean
-#	-$(MAKE) -C $(ROOT)/extern/icu/source distclean
-	-$(MAKE) -C $(ROOT)/extern/btyacc distclean
 
 clean_dbs:
 	$(RM) *.fdb *.FDB msg.timestamp
@@ -687,9 +684,6 @@
 clean_editline:
 	-$(MAKE) -C $(ROOT)/extern/editline clean
 
-#clean_icu:
-#	-$(MAKE) -C $(ROOT)/extern/icu/source clean
-
 clean_tommath:
 	-$(MAKE) -C $(ROOT)/extern/libtommath clean
 
diff -ruN Firebird-3.0.2.32703-0.orig/builds/posix/make.defaults Firebird-3.0.2.32703-0/builds/posix/make.defaults
--- Firebird-3.0.2.32703-0.orig/builds/posix/make.defaults	2017-03-21 10:11:35.000000000 +0100
+++ Firebird-3.0.2.32703-0/builds/posix/make.defaults	2017-05-14 01:29:54.590235045 +0200
@@ -155,7 +155,7 @@
 AR=			ar @AR_OPTIONS@
 LN=			@LN_S@
 RANLIB=			@RANLIB@
-BTYACC=$(ROOT)/extern/btyacc/btyacc
+BTYACC=/usr/bin/btyacc
 CLOOP=$(GEN_ROOT)/$(TARGET)/cloop/release/bin/cloop
 
 CC =	@CC@