Made PKG_CHECK_MODULES with --enable-libcdio conditional

configure.ac

@@ -224,6 +224,15 @@ dnl The empty yes case obviously causes -lcdio to be linked
 else
     LIBCDIO_DEF=
 fi
+if test x$LIBCDIO_DEF = x
+then
+    if test x$enable_libcdio = xyes
+    then
+      echo "WARNING: could not enable use of libcdio as system adapter"
+    fi
+else
+    echo "enabled  EXPERIMENTAL use of libcdio as system adapter"
+fi
 AC_SUBST(LIBCDIO_DEF)
 
 
@@ -309,36 +318,31 @@ AC_ARG_ENABLE(pkg-check-modules,
                , enable_pkg_check_modules=no)
 if test x$enable_pkg_check_modules = xyes; then
 
-dnl if PKG_CHECK_MODULES is to be used after this if-block,
+dnl If PKG_CHECK_MODULES is to be used after this if-block,
 dnl then it might be necessary to perform PKG_PROG_PKG_CONFIG before the block.
 
   LIBBURN_REQUIRED=1.1.4
   LIBISOFS_REQUIRED=1.1.5
   PKG_CHECK_MODULES(LIBBURN, libburn-1 >= $LIBBURN_REQUIRED)
   PKG_CHECK_MODULES(LIBISOFS, libisofs-1 >= $LIBISOFS_REQUIRED)
+  if test x$LIBCDIO_DEF = x; then
+    dummy=dummy
+  else
+    LIBCDIO_REQUIRED=0.83
+    PKG_CHECK_MODULES(LIBCDIO, libcdio >= $LIBCDIO_REQUIRED)
+  fi
 else
   echo "checking for LIBBURN... skipped, no --enable-pkg-check-modules"
   echo "checking for LIBISOFS... skipped, no --enable-pkg-check-modules"
+  if test x$LIBCDIO_DEF = x; then
+    dummy=dummy
+  else
+    echo "checking for LIBCDIO... skipped, no --enable-pkg-check-modules"
+  fi
 fi
 
 # ------- Visible mark in configure : End of library check
 
-
-if test x$LIBCDIO_DEF = x
-then
-    if test x$enable_libcdio = xyes
-    then
-      echo "WARNING: could not enable use of libcdio as system adapter"
-    fi
-else
-    echo "enabled  EXPERIMENTAL use of libcdio as system adapter"
-
-dnl For some reason this check may not be done earlier or else pkg-config
-dnl is not found.
-    LIBCDIO_REQUIRED=0.83
-    PKG_CHECK_MODULES(LIBCDIO, libcdio >= $LIBCDIO_REQUIRED)
-fi
-
 dnl Add compiler-specific flags
 
 dnl See if the user wants aggressive optimizations of the code