diff --git a/SRC/plugins/dns/configure.ac b/SRC/plugins/dns/configure.ac
index e31c102..2f250ba 100644
--- a/SRC/plugins/dns/configure.ac
+++ b/SRC/plugins/dns/configure.ac
@@ -7,6 +7,19 @@ dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
 
+AC_ARG_WITH(popt,
+ [--with-popt[=DIR]  popt command-line parsing library],dnl
+ [if test "$withval" != "no"; then
+   if test "$withval" != "yes"; then
+        POPTROOT=$withval
+        LDFLAGS="${LDFLAGS} -L$POPTROOT/lib"
+        CPPFLAGS="${CPPFLAGS} -I$POPTROOT/include"  
+   fi
+  else
+        AC_MSG_ERROR([The popt command-line parsing library is mandatory for this plugin])
+ fi],
+)
+
 DNS_BUILD=1
 AC_CHECK_FUNCS(poptGetContext,, 
    [AC_CHECK_LIB(popt,poptGetContext,,[AC_MSG_WARN([No popt development environment found, not building this plugin]) && DNS_BUILD=0])])
diff --git a/SRC/plugins/whois/configure.ac b/SRC/plugins/whois/configure.ac
index 7caeb63..512bcb4 100644
--- a/SRC/plugins/whois/configure.ac
+++ b/SRC/plugins/whois/configure.ac
@@ -7,6 +7,19 @@ dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
 
+AC_ARG_WITH(popt,
+ [--with-popt[=DIR]  popt command-line parsing library],dnl
+ [if test "$withval" != "no"; then
+   if test "$withval" != "yes"; then
+        POPTROOT=$withval
+        LDFLAGS="${LDFLAGS} -L$POPTROOT/lib"
+        CPPFLAGS="${CPPFLAGS} -I$POPTROOT/include"  
+   fi
+  else
+        AC_MSG_ERROR([The popt command-line parsing library is mandatory for this plugin])
+ fi],
+)
+
 WHOIS_BUILD=1
 AC_CHECK_FUNCS(poptGetContext,, 
    [AC_CHECK_LIB(popt,poptGetContext,,[AC_MSG_WARN([No popt development environment found, not building this plugin]) && WHOIS_BUILD=0])])