Package sipgrep is missing dependencies for the following libraries:
libpthread.so.1
Makefile:47: recipe for target '/build/lede-17.01/slaves/phase2/arc_archs/build/sdk/bin/packages/arc_archs/packages/sipgrep_20160914-devel-1_arc_archs.ipk' failed
make[3]: *** [/build/lede-17.01/slaves/phase2/arc_archs/build/sdk/bin/packages/arc_archs/packages/sipgrep_20160914-devel-1_arc_archs.ipk] Error 1