checking for main in -ldouble-conversion... no

[hljwang3874149]

on mac 10.11.3
Warning: boost-1.58.0 already installed
Warning: double-conversion-1.1.5 already installed
Warning: gflags-2.1.2 already installed
Warning: glog-0.3.4 already installed
Warning: libevent-2.0.22 already installed

i download double-conversion in /usr/local/Cellar/double-conversion
but can't found it . why?

[JohnnyYin]

I've had the same problem.

[bertmaher]

To make sure you have double-conversion properly linked, can you do:

ls /usr/local/include/double-conversion 
ls /usr/local/lib/libdouble-conversion.a

and check that those actually exist?
If not try brew link double-conversion, or possible brew link --force double-conversion

[hljwang3874149]

actually exist
bignum.h double-conversion.h ieee.h
cached-powers.h fast-dtoa.h strtod.h
diy-fp.h fixed-dtoa.h utils.h
localhost:double-conversion wangxiaolong$ ls /usr/local/lib/libdouble-conversion.a
/usr/local/lib/libdouble-conversion.a

[bertmaher]

Ah, I think our configure check for double-conversion might be kinda broken even though it works on my dev box. I'll push an update.