--- a/Makefile.in
+++ b/Makefile.in
@@ -44,9 +44,9 @@ LUA_LIB=$(LUA_HOME)/src/liblua.a
 
 ######
 LIBRRDTOOL_HOME=${PWD}/third-party/rrdtool-1.4.8
-HAS_LIBRRDTOOL=$(shell pkg-config --atleast-version=1.4.8 librrd && echo 0)
+HAS_LIBRRDTOOL=$(shell ${PKG_CONFIG} --atleast-version=1.4.8 librrd && echo 0)
 ifeq ($(HAS_LIBRRDTOOL), 0)
-	LIBRRDTOOL_INC = $(shell pkg-config --cflags librrd)
+	LIBRRDTOOL_INC = $(shell ${PKG_CONFIG} --cflags librrd)
 	LIBRRDTOOL_LIB = @LIBRRD_LD_FLAGS@
 else
 	LIBRRDTOOL_INC=-I$(LIBRRDTOOL_HOME)/src/
@@ -74,21 +74,21 @@ SNMP_LIB=@SNMP_LIB@
 ######
 
 ifeq (@NEDGE@, 0)
- HAS_SODIUM=$(shell pkg-config --exists libsodium && echo 0)
+ HAS_SODIUM=$(shell ${PKG_CONFIG} --exists libsodium && echo 0)
  ifeq ($(HAS_SODIUM), 0)
-	SODIUM_INC = $(shell pkg-config --cflags libsodium)
-	SODIUM_LIB = $(shell pkg-config --libs libsodium)
+	SODIUM_INC = $(shell ${PKG_CONFIG} --cflags libsodium)
+	SODIUM_LIB = $(shell ${PKG_CONFIG} --libs libsodium)
  else
 	SODIUM_INC=
 	SODIUM_LIB=
  endif
 
- HAS_ZEROMQ=$(shell pkg-config --exists libzmq && echo 0)
+ HAS_ZEROMQ=$(shell ${PKG_CONFIG} --exists libzmq && echo 0)
  ifeq ($(HAS_ZEROMQ), 0)
-	ZEROMQ_INC = $(shell pkg-config --cflags libzmq)
+	ZEROMQ_INC = $(shell ${PKG_CONFIG} --cflags libzmq)
 	ZMQ_STATIC=/usr/local/lib/libzmq.a
 	ifeq ($(wildcard $(ZMQ_STATIC)),)
-		ZEROMQ_LIB = $(shell pkg-config --libs libzmq)
+		ZEROMQ_LIB = $(shell ${PKG_CONFIG} --libs libzmq)
 	else
 		ZEROMQ_LIB = $(ZMQ_STATIC)
 	endif
@@ -98,9 +98,9 @@ ifeq (@NEDGE@, 0)
 	ZEROMQ_LIB=$(ZEROMQ_HOME)/.libs/libzmq.a
  endif
 
- HAS_ZSTD=$(shell pkg-config --exists libzstd && echo 0)
+ HAS_ZSTD=$(shell ${PKG_CONFIG} --exists libzstd && echo 0)
  ifeq ($(HAS_ZSTD), 0)
-	ZSTD_LIB = $(shell pkg-config --libs libzstd)
+	ZSTD_LIB = $(shell ${PKG_CONFIG} --libs libzstd)
  endif
 endif
 
--- a/configure.seed
+++ b/configure.seed
@@ -190,10 +190,10 @@ if test -z "$NDPI_INC" || test -z "$NDPI_LIB" ; then :
 fi
 dnl finish: nDPI handling
 
-pkg-config --exists json-c
+${PKG_CONFIG} --exists json-c
 if test "$?" -ne 1; then
-  JSON_INC=`pkg-config --cflags json-c`
-  JSON_LIB=`pkg-config --libs json-c`
+  JSON_INC=`${PKG_CONFIG} --cflags json-c`
+  JSON_LIB=`${PKG_CONFIG} --libs json-c`
 else
   echo "Please install libjson-c-dev package prerequisite"
   exit -1
@@ -211,11 +211,11 @@ dnl>     JSON_LIB=$JSON_HOME/libjson-c.a
 dnl>   fi
 dnl> fi
 
-pkg-config --exists libssl
+${PKG_CONFIG} --exists libssl
 if test "$?" -ne 1; then
   AC_DEFINE_UNQUOTED(NO_SSL_DL, 1, [has openssl])
-  SSL_INC="`pkg-config --cflags libssl` -I/usr/include/openssl"
-  SSL_LIB="`pkg-config --libs libssl` -lssl -lcrypto"
+  SSL_INC="`${PKG_CONFIG} --cflags libssl` -I/usr/include/openssl"
+  SSL_LIB="`${PKG_CONFIG} --libs libssl` -lssl -lcrypto"
 else
   dnl Workaround for MacOS Brew
   if test -d "/usr/local/opt/openssl/lib"; then
@@ -329,8 +329,8 @@ AC_DEFINE_UNQUOTED(PACKAGE_REVISION, "${GIT_COMMITS}", [Package Revision])
 AC_DEFINE_UNQUOTED(NTOPNG_GIT_RELEASE, "${GIT_BRANCH}:${GIT_RELEASE}", [GIT Release])
 AC_DEFINE_UNQUOTED(NTOPNG_GIT_DATE, "${GIT_DATE}", [Last GIT change])
 
-if test -z `which pkg-config`; then
-  echo "#!/bin/sh\n" > pkg-config
+if test -z `which ${PKG_CONFIG}`; then
+  echo "#!/bin/sh\n" > ${PKG_CONFIG}
 fi
 
 if test -f ".git/index"; then
@@ -362,8 +362,8 @@ DATE=`date +"%Y-%m-%d"`
 
 if test -d "/usr/include/hiredis"; then
   AC_DEFINE_UNQUOTED(HAVE_HIREDIS, 1, [Local hiredis package present])
-  HIREDIS_INC="`pkg-config --cflags hiredis` -I/usr/include/hiredis"
-  HIREDIS_LIB="`pkg-config --libs hiredis` -lhiredis"
+  HIREDIS_INC="`${PKG_CONFIG} --cflags hiredis` -I/usr/include/hiredis"
+  HIREDIS_LIB="`${PKG_CONFIG} --libs hiredis` -lhiredis"
 else
   HIREDIS_INC="-I ${PWD}/third-party/hiredis"
 fi
@@ -490,7 +490,7 @@ if test x$UGLIFYJS != x; then
   UGLIFYJS_MAJOR_VERSION="${UGLIFYJS_VERSION%%.*}"
 fi
 
-AC_CHECK_LIB([rrd_th], [rrd_update_r], [LIBRRD_LD_FLAGS=-lrrd_th], [LIBRRD_LD_FLAGS=`pkg-config --libs librrd`])
+AC_CHECK_LIB([rrd_th], [rrd_update_r], [LIBRRD_LD_FLAGS=-lrrd_th], [LIBRRD_LD_FLAGS=`${PKG_CONFIG} --libs librrd`])
 
 AC_CHECK_LIB([nl], [nl_handle_alloc], [LDFLAGS="${LDFLAGS} -lnl"])
 AC_CHECK_LIB([rt], [clock_gettime],   [LDFLAGS="${LDFLAGS} -lrt"])
@@ -509,7 +509,7 @@ else
   dnl> https://github.com/curl/curl/blob/curl-7_20_0/TODO-RELEASE
 
   AC_MSG_CHECKING(for curl SMTP support)
-  if `pkg-config --atleast-version="7.20.0" libcurl` ; then
+  if `${PKG_CONFIG} --atleast-version="7.20.0" libcurl` ; then
     AC_DEFINE_UNQUOTED(HAVE_CURL_SMTP, 1, [curl supports SMTP])
     AC_MSG_RESULT(yes)
   else