diff --git a/ChangeLog b/ChangeLog
index e364699..c5e313b 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@
 - Fix bug in sorting when guessing flow direction. Issue #92
 - Update nfdump.1 man page for xsrcport & xdstport aggregations. Request #109
 - Fix minor bugs
+- Fix definition for InfluxDB in configure.ac Issue #98
 
 2018-04-01
 - Add program exit in nfx.c after panic with correupt data file
diff --git a/bin/lz4.h b/bin/lz4.h
index 3cf6c8d..430d73f 100755
--- a/bin/lz4.h
+++ b/bin/lz4.h
@@ -281,6 +281,10 @@ LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char*
  */
 LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
 
+// add missing prototypes
+int LZ4_compress_fast_force(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration);
+int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int inputSize);
+int LZ4_decompress_safe_forceExtDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize);
 
 /*-**********************************************
 *  Streaming Decompression Functions
diff --git a/configure.ac b/configure.ac
index bc639be..2863e91 100755
--- a/configure.ac
+++ b/configure.ac
@@ -189,8 +189,10 @@ AS_IF([test "x$influxdb" = xyes], [
 	AC_CHECK_LIB([curl], [curl_free],,[AC_MSG_ERROR([libcurl required!])])
 	
 	AC_DEFINE_UNQUOTED(HAVE_INFLUXDB, 1, [enable stats to influxdb])
-], [ 
-])
+	AM_CONDITIONAL(INFLXDB, true)
+], 
+AM_CONDITIONAL(INFLXDB, false)
+)
 
 AC_ARG_ENABLE(nftrack,
 [  --enable-nftrack      Build nftrack used by PortTracker; default is NO],