diff -Nrup a/configure.ac b/configure.ac
--- a/configure.ac	2006-12-01 12:32:10.000000000 +0100
+++ b/configure.ac	2023-02-25 04:57:46.080994440 +0100
@@ -9,6 +9,8 @@ AC_SUBST(ISODATE)
 
 AC_CANONICAL_HOST
 
+LT_INIT([dlopen])
+
 AM_DISABLE_STATIC
 AM_ENABLE_SHARED
 
@@ -38,12 +40,8 @@ CFLAGS="$CFLAGS $X_CFLAGS"
 dnl Checks for library functions.
 AC_CHECK_HEADERS(linux/hdreg.h)
 
-AC_CHECK_PROG([IMLIB2_CONFIG_IN_PATH],[imlib2-config],[yes],[no])
-if test "x$IMLIB2_CONFIG_IN_PATH" = "xno"; then
-  AC_ERROR([imlib2-config not found in PATH.. You need to install Imlib2 (and its developpement package)])
-fi
-IMLIB2_CFLAGS=$(imlib2-config --cflags)
-IMLIB2_LIBS=$(imlib2-config --libs)
+IMLIB2_CFLAGS=$(pkg-config --cflags imlib2)
+IMLIB2_LIBS=$(pkg-config --libs imlib2)
 AC_SUBST(IMLIB2_CFLAGS)
 AC_SUBST(IMLIB2_LIBS)
 
@@ -87,9 +85,9 @@ if test "x$build_gkforkplop" = "xno"; th
 else
   echo building with GKFORKPLOP, checking for gtk2..
   pkg_modules="gtk+-2.0 >= 2.0.0"
-  PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
-  GTK2_CFLAGS=$PACKAGE_CFLAGS;
-  GTK2_LIBS=$PACKAGE_LIBS;
+  PKG_CHECK_MODULES(PACKAGE2, [$pkg_modules])
+  GTK2_CFLAGS=$PACKAGE2_CFLAGS;
+  GTK2_LIBS=$PACKAGE2_LIBS;
   AC_SUBST(GTK2_CFLAGS)
   AC_SUBST(GTK2_LIBS)
   SAVECPPFLAGS="$CPPFLAGS"
@@ -99,7 +97,7 @@ else
      echo -e "${YELLOW}gkrellm2/gkrellm.h header not found or unusable${RESET}... cannot build gkforkplop.so"
      build_gkforkplop="no"
   else
-    GKFORKPLOP="gkforkplop.so"
+    GKFORKPLOP="gkforkplop.la"
   fi
   CPPFLAGS="$SAVECPPFLAGS"
 fi