I am attempting to add JSON support for the REST module on Centos 6.5

I have installed the json-c-devel package however when compiling FreeRADIUS it complains it can't find it:

[root@dhcp01]# ./configure --with-dhcp --with-experimental-modules

checking for json/json.h... yes
checking for json_c_version in -ljson-c in /usr/lib64... no
checking for json_c_version in -ljson-c... no
checking for json_c_version in -ljson-c in /usr/local/lib... no
checking for json_c_version in -ljson-c in /opt/lib... no
configure: WARNING: json-c libraries not found. Use --with-jsonc-lib-dir=<path>.
configure: WARNING: silently building without JSON support. requires: json-c

[root@dhcp01 lib64]# yum install json-c-devel
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Setting up Install Process
Package json-c-devel-0.10-2.el6.x86_64 already installed and latest version
Nothing to do

I found that the JSON-C libraries are installed at /usr/lib64:


But seems to be missing libjson-c.so which I think may be the problem. I have also tried compiling specifying /usr/lib64 as the JSON-C Library path, but same outcome:

./configure --with-dhcp --with-experimental-modules --with-jsonc-lib-dir=/usr/lib64

1 Answer 1


Use v3.0.x head, the check was modified to include the json_tokener_new symbol in its checks, which is present in older versions of JSON-C. Or if you build JSON-C from src it should be a new enough version that it'll work.


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