--- /dev/null
+gcc-6 is more strict WRT narrowing:
+error: narrowing conversion of ‘-1’ from ‘int’ to ‘unsigned int’ inside { } [-Wnarrowing]
+
+https://bugs.gentoo.org/594912
+diff --git a/audio/hufftable.cpp b/audio/hufftable.cpp
+index 6bc8e86..5414ae3 100644
+--- a/audio/hufftable.cpp
++++ b/audio/hufftable.cpp
+@@ -552,3 +552,3 @@ const HUFFMANCODETABLE MPEGaudio::ht[HTN]=
+ {
+- { 0, 0-1, 0-1, 0, 0, htd33},
++ { 0, ~0u, ~0u, 0, 0, htd33},
+ { 1, 2-1, 2-1, 0, 7,htd01},
+@@ -556,3 +556,3 @@ const HUFFMANCODETABLE MPEGaudio::ht[HTN]=
+ { 3, 3-1, 3-1, 0, 17,htd03},
+- { 4, 0-1, 0-1, 0, 0, htd33},
++ { 4, ~0u, ~0u, 0, 0, htd33},
+ { 5, 4-1, 4-1, 0, 31,htd05},
+@@ -566,3 +566,3 @@ const HUFFMANCODETABLE MPEGaudio::ht[HTN]=
+ {13,16-1,16-1, 0,511,htd13},
+- {14, 0-1, 0-1, 0, 0, htd33},
++ {14,~0u, ~0u, 0, 0, htd33},
+ {15,16-1,16-1, 0,511,htd15},