Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
fgrep: warning: fgrep is obsolescent; using grep -F
checking for SHA256_Init in -lcrypto... yes
checking for json_loads in -ljansson... no
configure: error: "library jansson not found"
RPM build errors:
error: Bad exit status from /var/tmp/rpm-tmp.8vVNSV (%build)
    Bad exit status from /var/tmp/rpm-tmp.8vVNSV (%build)
This snippet show where configure script failed. 