fix-ekho-build-configure.ac.diff

--- ../configure.ac.orig	2020-02-19 13:10:41.419383896 +0100
+++ configure.ac	2020-02-19 14:14:36.189197818 +0100
@@ -106,9 +106,20 @@
           [AC_MSG_FAILURE([ncurses test failed])],
           [])
 
+          AC_LANG_CPLUSPLUS()
+          AC_CHECK_LIB([estbase], [main], [],
+            [AC_MSG_FAILURE([estbase test failed])],
+            []
+          )
+
+          AC_CHECK_LIB([eststring], [main], [],
+            [AC_MSG_FAILURE([eststring test failed])],
+            []
+          )
+
           AC_CHECK_LIB([estools], [main], [],
             [AC_MSG_FAILURE([estool test failed])],
-            []
+            [-lncurses]
           )
 
           AC_CHECK_LIB([Festival], [main], [
@@ -121,7 +132,7 @@
               LIB_FESTIVAL="${srcdir}/lib/libFestival.a ${srcdir}/lib/libestools.a ${srcdir}/lib/libestbase.a ${srcdir}/lib/libeststring.a -lncurses"
               CFLAG_FESTIVAL="-I${srcdir}/include -I${srcdir}/include/festival -I${srcdir}/include/speech_tools"
             ],
-            []
+            [-lestbase -leststring -lncurses]
           )
         ],
         [LIB_FESTIVAL=""
@@ -183,7 +194,7 @@
             AC_MSG_FAILURE(
                 [--with-mp3lame was given, but test for mp3lame failed])
             fi
-            ], [])])
+            ], [-lncurses])])
 
 AC_ARG_ENABLE(dist-voice,
         [  --disable-dist-voice],