diff --git a/src/lib/ims/Makefile b/src/lib/ims/Makefile
index 482404ca36e..9c9539bc745 100644
--- a/src/lib/ims/Makefile
+++ b/src/lib/ims/Makefile
@@ -11,9 +11,9 @@ BUGFIX_VER=0
 DEFS+=-DSER
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/app_python3/Makefile b/src/modules/app_python3/Makefile
index c357ebc09ee..03c3da142c5 100644
--- a/src/modules/app_python3/Makefile
+++ b/src/modules/app_python3/Makefile
@@ -12,15 +12,15 @@ ifeq ($(PYTHON3),)
 PYTHON3=python
 endif
 
-PYTHON3CONFIG=$(shell which ${PYTHON3}-config)
+PYTHON3CONFIG:=$(shell which ${PYTHON3}-config)
 ifeq ($(PYTHON3CONFIG),)
 python_version_full := $(wordlist 2,4,$(subst ., ,$(shell ${PYTHON3} --version 2>&1)))
 python_version_major := $(word 1,${python_version_full})
 python_version_minor := $(word 2,${python_version_full})
 PYTHON3 = python${python_version_major}.${python_version_minor}
-PYTHON3CONFIG=$(shell which ${PYTHON3}-config)
+PYTHON3CONFIG:=$(shell which ${PYTHON3}-config)
 ifeq ($(PYTHON3CONFIG),)
-PYTHON3CONFIG=${PYTHON3}-config
+PYTHON3CONFIG:=${PYTHON3}-config
 endif
 endif
 
diff --git a/src/modules/app_python3s/Makefile b/src/modules/app_python3s/Makefile
index 8edf4292406..ef50c9aae74 100644
--- a/src/modules/app_python3s/Makefile
+++ b/src/modules/app_python3s/Makefile
@@ -12,15 +12,15 @@ ifeq ($(PYTHON3),)
 PYTHON3=python
 endif
 
-PYTHON3CONFIG=$(shell which ${PYTHON3}-config)
+PYTHON3CONFIG:=$(shell which ${PYTHON3}-config)
 ifeq ($(PYTHON3CONFIG),)
 python_version_full := $(wordlist 2,4,$(subst ., ,$(shell ${PYTHON3} --version 2>&1)))
 python_version_major := $(word 1,${python_version_full})
 python_version_minor := $(word 2,${python_version_full})
 PYTHON3 = python${python_version_major}.${python_version_minor}
-PYTHON3CONFIG=$(shell which ${PYTHON3}-config)
+PYTHON3CONFIG:=$(shell which ${PYTHON3}-config)
 ifeq ($(PYTHON3CONFIG),)
-PYTHON3CONFIG=${PYTHON3}-config
+PYTHON3CONFIG:=${PYTHON3}-config
 endif
 endif
 
diff --git a/src/modules/auth_ephemeral/Makefile b/src/modules/auth_ephemeral/Makefile
index bdfde40de3a..1eecce8b971 100644
--- a/src/modules/auth_ephemeral/Makefile
+++ b/src/modules/auth_ephemeral/Makefile
@@ -7,7 +7,7 @@ auto_gen=
 NAME=auth_ephemeral.so
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
diff --git a/src/modules/auth_identity/Makefile b/src/modules/auth_identity/Makefile
index 80791d7080e..daf9ea4dbb2 100644
--- a/src/modules/auth_identity/Makefile
+++ b/src/modules/auth_identity/Makefile
@@ -4,13 +4,13 @@ auto_gen=
 NAME=auth_identity.so
 
 ifeq ($(CROSS_COMPILE),)
-CURL_BUILDER=$(shell \
+CURL_BUILDER:=$(shell \
 	if pkg-config --exists libcurl; then \
 		echo 'pkg-config libcurl'; \
 	else \
 		which curl-config; \
 	fi)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
diff --git a/src/modules/cdp/Makefile b/src/modules/cdp/Makefile
index e2d0211f654..6ba565ab7df 100644
--- a/src/modules/cdp/Makefile
+++ b/src/modules/cdp/Makefile
@@ -5,9 +5,9 @@ auto_gen=
 NAME=cdp.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/cnxcc/Makefile b/src/modules/cnxcc/Makefile
index 708e9f68842..63730d128d6 100644
--- a/src/modules/cnxcc/Makefile
+++ b/src/modules/cnxcc/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=cnxcc.so
 
 ifeq ($(CROSS_COMPILE),)
-HIREDIS_BUILDER = $(shell \
+HIREDIS_BUILDER:= $(shell \
 	if pkg-config --exists hiredis; then \
 		echo 'pkg-config hiredis'; \
 	fi)
@@ -30,7 +30,7 @@ endif
 endif
 
 ifeq ($(CROSS_COMPILE),)
-LEVENT_BUILDER = $(shell \
+LEVENT_BUILDER:= $(shell \
 	if pkg-config --exists libevent; then \
 		echo 'pkg-config libevent'; \
 	fi)
diff --git a/src/modules/cplc/Makefile b/src/modules/cplc/Makefile
index dde31ef5046..0d50957982d 100644
--- a/src/modules/cplc/Makefile
+++ b/src/modules/cplc/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=cplc.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/crypto/Makefile b/src/modules/crypto/Makefile
index d64875b4c41..9cd2a778042 100644
--- a/src/modules/crypto/Makefile
+++ b/src/modules/crypto/Makefile
@@ -7,7 +7,7 @@ auto_gen=
 NAME=crypto.so
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
diff --git a/src/modules/db_postgres/Makefile b/src/modules/db_postgres/Makefile
index dc5ca62b9b4..59c04db7d63 100644
--- a/src/modules/db_postgres/Makefile
+++ b/src/modules/db_postgres/Makefile
@@ -10,7 +10,7 @@ NAME=db_postgres.so
 # CROSS_COMPILE=true
 
 ifeq ($(CROSS_COMPILE),)
-LIBPQ_BUILDER = $(shell \
+LIBPQ_BUILDER:= $(shell \
 	if pkg-config --exists libpq; then \
 		echo 'pkg-config libpq'; \
 	fi)
diff --git a/src/modules/db_redis/Makefile b/src/modules/db_redis/Makefile
index 179bc6f4068..8dab90ab74e 100644
--- a/src/modules/db_redis/Makefile
+++ b/src/modules/db_redis/Makefile
@@ -37,7 +37,7 @@ endif
 endif
 
 DEFS+=$(HIREDISDEFS)
-LIBS=$(HIREDISLIBS)
+LIBS:=$(HIREDISLIBS)
 
 ifneq ($(HIREDIS_CLUSTER_BUILDER),)
 	HIREDISCLUSTERDEFS = $(shell $(HIREDIS_CLUSTER_BUILDER) --cflags)
diff --git a/src/modules/dialplan/Makefile b/src/modules/dialplan/Makefile
index abb4bf8388b..e231a47e2a2 100644
--- a/src/modules/dialplan/Makefile
+++ b/src/modules/dialplan/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=dialplan.so
 
 ifeq ($(CROSS_COMPILE),)
-PCRE_BUILDER = $(shell \
+PCRE_BUILDER:= $(shell \
 	if pkg-config --exists libcre; then \
 		echo 'pkg-config libpcre'; \
 	else \
diff --git a/src/modules/gzcompress/Makefile b/src/modules/gzcompress/Makefile
index 5e77a0b7f44..275a0e173e5 100644
--- a/src/modules/gzcompress/Makefile
+++ b/src/modules/gzcompress/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=gzcompress.so
 
 ifeq ($(CROSS_COMPILE),)
-	BUILDER = $(shell which pkg-config)
+	BUILDER:= $(shell which pkg-config)
 endif
 
 ifneq ($(BUILDER),)
diff --git a/src/modules/http_async_client/Makefile b/src/modules/http_async_client/Makefile
index 1af95ac0ff5..35aa36c9641 100644
--- a/src/modules/http_async_client/Makefile
+++ b/src/modules/http_async_client/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=http_async_client.so
 
 ifeq ($(CROSS_COMPILE),)
-CURL_BUILDER=$(shell \
+CURL_BUILDER:=$(shell \
 	if pkg-config --exists libcurl; then \
 		echo 'pkg-config libcurl'; \
 	else \
@@ -32,10 +32,10 @@ endif
 
 ifeq ($(LEVENT_BUILDER),)
 	LEVENTDEFS=-I$(LOCALBASE)/include -I$(SYSBASE)/include
-	LEVENTLIBS=-L$(LOCALBASE)/lib -levent
+	LEVENTLIBS:=-L$(LOCALBASE)/lib -levent
 else
 	LEVENTDEFS = $(shell $(LEVENT_BUILDER) --cflags)
-	LEVENTLIBS = $(shell $(LEVENT_BUILDER) --libs)
+	LEVENTLIBS:= $(shell $(LEVENT_BUILDER) --libs)
 endif
 
 DEFS+=$(CURLDEFS) $(LEVENTDEFS)
diff --git a/src/modules/http_client/Makefile b/src/modules/http_client/Makefile
index a0b38a9c0de..8160c9a163b 100644
--- a/src/modules/http_client/Makefile
+++ b/src/modules/http_client/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=http_client.so
 
 ifeq ($(CROSS_COMPILE),)
-CURL_BUILDER=$(shell \
+CURL_BUILDER:=$(shell \
 	if pkg-config --exists libcurl; then \
 		echo 'pkg-config libcurl'; \
 	else \
diff --git a/src/modules/ims_auth/Makefile b/src/modules/ims_auth/Makefile
index 628632badb7..02547cc45e0 100644
--- a/src/modules/ims_auth/Makefile
+++ b/src/modules/ims_auth/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=ims_auth.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/ims_icscf/Makefile b/src/modules/ims_icscf/Makefile
index ffc05f295b3..4a84b57123f 100644
--- a/src/modules/ims_icscf/Makefile
+++ b/src/modules/ims_icscf/Makefile
@@ -8,9 +8,9 @@ auto_gen=
 NAME=ims_icscf.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/ims_isc/Makefile b/src/modules/ims_isc/Makefile
index d0244d001cc..6c25a40962f 100644
--- a/src/modules/ims_isc/Makefile
+++ b/src/modules/ims_isc/Makefile
@@ -8,9 +8,9 @@ auto_gen=
 NAME=ims_isc.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/ims_registrar_pcscf/Makefile b/src/modules/ims_registrar_pcscf/Makefile
index 8fae1cab1af..19e9a730c52 100644
--- a/src/modules/ims_registrar_pcscf/Makefile
+++ b/src/modules/ims_registrar_pcscf/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=ims_registrar_pcscf.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/ims_registrar_scscf/Makefile b/src/modules/ims_registrar_scscf/Makefile
index 6f66edd7ec7..6d23c714b9a 100644
--- a/src/modules/ims_registrar_scscf/Makefile
+++ b/src/modules/ims_registrar_scscf/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=ims_registrar_scscf.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/jansson/Makefile b/src/modules/jansson/Makefile
index 7362ec18071..e45ba72e283 100644
--- a/src/modules/jansson/Makefile
+++ b/src/modules/jansson/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=jansson.so
 
 ifeq ($(CROSS_COMPILE),)
-JNS_BUILDER=$(shell \
+JNS_BUILDER:=$(shell \
 	if pkg-config --exists jansson; then \
 		echo 'pkg-config jansson'; \
 	fi)
diff --git a/src/modules/kazoo/Makefile b/src/modules/kazoo/Makefile
index b7b1e1615cd..038a749f52b 100644
--- a/src/modules/kazoo/Makefile
+++ b/src/modules/kazoo/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=kazoo.so
 JLIB=json
 
-BUILDER = $(shell which pkg-config)
+BUILDER:= $(shell which pkg-config)
 ifeq ($(BUILDER),)
 	JSONC=$(shell ls $(SYSBASE)/include/lib/libjson*.so $(LOCALBASE)/lib/libjson*.so 2>/dev/null | grep json-c)
 else
diff --git a/src/modules/lcr/Makefile b/src/modules/lcr/Makefile
index 56be2e3a741..c31688aa3c0 100644
--- a/src/modules/lcr/Makefile
+++ b/src/modules/lcr/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=lcr.so
 
 ifeq ($(CROSS_COMPILE),)
-PCRE_BUILDER = $(shell \
+PCRE_BUILDER:= $(shell \
 	if pkg-config --exists libcre; then \
 		echo 'pkg-config libpcre'; \
 	else \
diff --git a/src/modules/log_systemd/Makefile b/src/modules/log_systemd/Makefile
index b1ab763c286..cf027bbba8c 100644
--- a/src/modules/log_systemd/Makefile
+++ b/src/modules/log_systemd/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=log_systemd.so
 
 ifeq ($(CROSS_COMPILE),)
-SYSTEMD_BUILDER=$(shell \
+SYSTEMD_BUILDER:=$(shell \
 	if pkg-config --exists libsystemd; then \
 		echo 'pkg-config libsystemd'; \
 	fi)
diff --git a/src/modules/lost/Makefile b/src/modules/lost/Makefile
index b847094e1ca..05f2e030c68 100755
--- a/src/modules/lost/Makefile
+++ b/src/modules/lost/Makefile
@@ -9,14 +9,14 @@ auto_gen=
 NAME=lost.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
 endif
-CURL_BUILDER=$(shell \
+CURL_BUILDER:=$(shell \
 	if pkg-config --exists libcurl; then \
 		echo 'pkg-config libcurl'; \
 	else \
diff --git a/src/modules/lwsc/Makefile b/src/modules/lwsc/Makefile
index 4201bfe42a1..c971e5ec035 100644
--- a/src/modules/lwsc/Makefile
+++ b/src/modules/lwsc/Makefile
@@ -7,7 +7,7 @@ auto_gen=
 NAME=lwsc.so
 
 ifeq ($(CROSS_COMPILE),)
-LWSC_BUILDER=$(shell \
+LWSC_BUILDER:=$(shell \
 	if pkg-config --exists libwebsockets; then \
 		echo 'pkg-config libwebsockets'; \
 	fi)
diff --git a/src/modules/ndb_redis/Makefile b/src/modules/ndb_redis/Makefile
index 66c34617fd9..9019ccb89b7 100644
--- a/src/modules/ndb_redis/Makefile
+++ b/src/modules/ndb_redis/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=ndb_redis.so
 
 ifeq ($(CROSS_COMPILE),)
-HIREDIS_BUILDER = $(shell \
+HIREDIS_BUILDER:= $(shell \
 	if pkg-config --exists hiredis; then \
 		echo 'pkg-config hiredis'; \
 	fi)
diff --git a/src/modules/osp/Makefile b/src/modules/osp/Makefile
index 06dfc70052c..65072eeede7 100644
--- a/src/modules/osp/Makefile
+++ b/src/modules/osp/Makefile
@@ -8,7 +8,7 @@ auto_gen=
 NAME=osp.so
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
diff --git a/src/modules/outbound/Makefile b/src/modules/outbound/Makefile
index 70d4102c01b..8a83e47087f 100644
--- a/src/modules/outbound/Makefile
+++ b/src/modules/outbound/Makefile
@@ -10,18 +10,15 @@ ifeq ($(CROSS_COMPILE),)
 endif
 
 ifneq ($(BUILDER),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
 
-CRYPTO_BUILDER=$(shell \
+CRYPTO_BUILDER:=$(shell \
 	if pkg-config --exists libcrypto; then \
 		echo 'pkg-config libcrypto'; \
 	fi)
-endif
-
-ifneq ($(BUILDER),)
 
 ifneq ($(SSL_BUILDER),)
 	DEFS += $(shell $(SSL_BUILDER) --cflags)
diff --git a/src/modules/presence/Makefile b/src/modules/presence/Makefile
index 3065f9d3a23..657f29f26f9 100644
--- a/src/modules/presence/Makefile
+++ b/src/modules/presence/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=presence.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/presence_conference/Makefile b/src/modules/presence_conference/Makefile
index 7fc0efc9c83..8d563783788 100644
--- a/src/modules/presence_conference/Makefile
+++ b/src/modules/presence_conference/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=presence_conference.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/presence_dialoginfo/Makefile b/src/modules/presence_dialoginfo/Makefile
index 4674a409fba..1ba5c28e944 100644
--- a/src/modules/presence_dialoginfo/Makefile
+++ b/src/modules/presence_dialoginfo/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=presence_dialoginfo.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/presence_reginfo/Makefile b/src/modules/presence_reginfo/Makefile
index b3bad627bda..262ae87a67b 100644
--- a/src/modules/presence_reginfo/Makefile
+++ b/src/modules/presence_reginfo/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=presence_reginfo.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/presence_xml/Makefile b/src/modules/presence_xml/Makefile
index 8d1fd9a8780..7ac3cba18a6 100644
--- a/src/modules/presence_xml/Makefile
+++ b/src/modules/presence_xml/Makefile
@@ -7,9 +7,9 @@ NAME=presence_xml.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua/Makefile b/src/modules/pua/Makefile
index cb45cee17e2..780875178d0 100644
--- a/src/modules/pua/Makefile
+++ b/src/modules/pua/Makefile
@@ -7,9 +7,9 @@ NAME=pua.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua_bla/Makefile b/src/modules/pua_bla/Makefile
index 75970244aec..9afb91e96c6 100755
--- a/src/modules/pua_bla/Makefile
+++ b/src/modules/pua_bla/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=pua_bla.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua_dialoginfo/Makefile b/src/modules/pua_dialoginfo/Makefile
index 18d2e2fc826..69e24729062 100644
--- a/src/modules/pua_dialoginfo/Makefile
+++ b/src/modules/pua_dialoginfo/Makefile
@@ -7,9 +7,9 @@ NAME=pua_dialoginfo.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua_reginfo/Makefile b/src/modules/pua_reginfo/Makefile
index d150c952dc2..7ccaf97b0f9 100644
--- a/src/modules/pua_reginfo/Makefile
+++ b/src/modules/pua_reginfo/Makefile
@@ -9,9 +9,9 @@ NAME=pua_reginfo.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua_usrloc/Makefile b/src/modules/pua_usrloc/Makefile
index bbf9c0bfb4b..d0e5369e780 100644
--- a/src/modules/pua_usrloc/Makefile
+++ b/src/modules/pua_usrloc/Makefile
@@ -7,9 +7,9 @@ NAME=pua_usrloc.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/pua_xmpp/Makefile b/src/modules/pua_xmpp/Makefile
index 8b53b35ebdd..b4e74ec6073 100644
--- a/src/modules/pua_xmpp/Makefile
+++ b/src/modules/pua_xmpp/Makefile
@@ -7,9 +7,9 @@ NAME= pua_xmpp.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/regex/Makefile b/src/modules/regex/Makefile
index 3b8758a0392..d5277fa9567 100644
--- a/src/modules/regex/Makefile
+++ b/src/modules/regex/Makefile
@@ -5,7 +5,7 @@ auto_gen=
 NAME=regex.so
 
 ifeq ($(CROSS_COMPILE),)
-PCRE_BUILDER = $(shell \
+PCRE_BUILDER:= $(shell \
 	if pkg-config --exists libcre; then \
 		echo 'pkg-config libpcre'; \
 	else \
diff --git a/src/modules/rls/Makefile b/src/modules/rls/Makefile
index e5c5e6a73b1..7ad0851fb4f 100644
--- a/src/modules/rls/Makefile
+++ b/src/modules/rls/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=rls.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/slack/Makefile b/src/modules/slack/Makefile
index a4f0c1ff814..1fb1e7a0210 100644
--- a/src/modules/slack/Makefile
+++ b/src/modules/slack/Makefile
@@ -9,7 +9,7 @@ auto_gen=
 NAME=slack.so
 
 ifeq ($(CROSS_COMPILE),)
-CURL_BUILDER=$(shell \
+CURL_BUILDER:=$(shell \
 	if pkg-config --exists libcurl; then \
 		echo 'pkg-config libcurl'; \
 	else \
diff --git a/src/modules/systemdops/Makefile b/src/modules/systemdops/Makefile
index 7af1f5efd3a..8bbfdfc2d2f 100644
--- a/src/modules/systemdops/Makefile
+++ b/src/modules/systemdops/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=systemdops.so
 
 ifeq ($(CROSS_COMPILE),)
-SYSTEMD_BUILDER=$(shell \
+SYSTEMD_BUILDER:=$(shell \
 	if pkg-config --exists libsystemd; then \
 		echo 'pkg-config libsystemd'; \
 	fi)
diff --git a/src/modules/tls/Makefile b/src/modules/tls/Makefile
index 9112150b8e9..11d3de7d7c8 100644
--- a/src/modules/tls/Makefile
+++ b/src/modules/tls/Makefile
@@ -16,11 +16,11 @@ LIBSSL_STATIC_SRCLIB ?= no
 LIBSSL_STATIC_SRCPATH ?= /usr/local/src/openssl
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
-CRYPTO_BUILDER=$(shell \
+CRYPTO_BUILDER:=$(shell \
 	if pkg-config --exists libcrypto; then \
 		echo 'pkg-config libcrypto'; \
 	fi)
diff --git a/src/modules/tlsa/Makefile b/src/modules/tlsa/Makefile
index 28b5c2692d3..9999d68e15b 100644
--- a/src/modules/tlsa/Makefile
+++ b/src/modules/tlsa/Makefile
@@ -18,11 +18,11 @@ LIBSSL_STATIC_SRCPATH ?= /usr/local/src/openssl
 # LIBSSL_STATIC_SRCPATH ?= /usr/lib/x86_64-linux-gnu/
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
-CRYPTO_BUILDER=$(shell \
+CRYPTO_BUILDER:=$(shell \
 	if pkg-config --exists libcrypto; then \
 		echo 'pkg-config libcrypto'; \
 	fi)
diff --git a/src/modules/topos_redis/Makefile b/src/modules/topos_redis/Makefile
index 74c5456af1b..c508b4f7354 100644
--- a/src/modules/topos_redis/Makefile
+++ b/src/modules/topos_redis/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=topos_redis.so
 
 ifeq ($(CROSS_COMPILE),)
-HIREDIS_BUILDER = $(shell \
+HIREDIS_BUILDER:= $(shell \
 	if pkg-config --exists hiredis; then \
 		echo 'pkg-config hiredis'; \
 	fi)
diff --git a/src/modules/utils/Makefile b/src/modules/utils/Makefile
index add1c86364c..6259d570c9a 100644
--- a/src/modules/utils/Makefile
+++ b/src/modules/utils/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=utils.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/uuid/Makefile b/src/modules/uuid/Makefile
index 141a350fcb5..5c3f705115b 100644
--- a/src/modules/uuid/Makefile
+++ b/src/modules/uuid/Makefile
@@ -6,7 +6,7 @@ auto_gen=
 NAME=uuid.so
 
 ifeq ($(CROSS_COMPILE),)
-BUILDER = $(shell \
+BUILDER:= $(shell \
 	if pkg-config --exists uuid; then \
 		echo 'pkg-config uuid'; \
 	fi)
diff --git a/src/modules/websocket/Makefile b/src/modules/websocket/Makefile
index 99b1fe1f8c3..9de7fe830e1 100644
--- a/src/modules/websocket/Makefile
+++ b/src/modules/websocket/Makefile
@@ -9,7 +9,7 @@ NAME=websocket.so
 EMBEDDED_UTF8_DECODE ?= 0
 
 ifeq ($(CROSS_COMPILE),)
-SSL_BUILDER=$(shell \
+SSL_BUILDER:=$(shell \
 	if pkg-config --exists libssl; then \
 		echo 'pkg-config libssl'; \
 	fi)
diff --git a/src/modules/xcap_server/Makefile b/src/modules/xcap_server/Makefile
index 0afbb2d6436..44a9810d9f3 100644
--- a/src/modules/xcap_server/Makefile
+++ b/src/modules/xcap_server/Makefile
@@ -9,9 +9,9 @@ auto_gen=
 NAME=xcap_server.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/xhttp_pi/Makefile b/src/modules/xhttp_pi/Makefile
index 79654878136..a58988e8c12 100644
--- a/src/modules/xhttp_pi/Makefile
+++ b/src/modules/xhttp_pi/Makefile
@@ -8,9 +8,9 @@ DEFS +=
 LIBS +=
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/xmlops/Makefile b/src/modules/xmlops/Makefile
index ec6a4e1fa67..1c54d9b29cf 100644
--- a/src/modules/xmlops/Makefile
+++ b/src/modules/xmlops/Makefile
@@ -9,9 +9,9 @@ NAME=xmlops.so
 LIBS=
 
 ifeq ($(CROSS_COMPILE),)
-PKGCFGTOOL=$(shell which xml2-config)
+PKGCFGTOOL:=$(shell which xml2-config)
 ifeq ($(PKGCFGTOOL),)
-PKGCFGTOOL=$(shell \
+PKGCFGTOOL:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)
diff --git a/src/modules/xmlrpc/Makefile b/src/modules/xmlrpc/Makefile
index 7a61d1025d0..e38e4cfcef4 100644
--- a/src/modules/xmlrpc/Makefile
+++ b/src/modules/xmlrpc/Makefile
@@ -6,9 +6,9 @@ auto_gen=
 NAME=xmlrpc.so
 
 ifeq ($(CROSS_COMPILE),)
-XML2CFG=$(shell which xml2-config)
+XML2CFG:=$(shell which xml2-config)
 ifeq ($(XML2CFG),)
-XML2CFG=$(shell \
+XML2CFG:=$(shell \
 	if pkg-config --exists libxml-2.0; then \
 		echo 'pkg-config libxml-2.0'; \
 	fi)