libnspr-dev 2:1.firefox1.5.dfsg+1.5.0.1-1ubuntu12 (amd64 binary) in ubuntu dapper

 NSPR provides platform independence for non-GUI operating system
 facilities including:
  * threads,
  * thread synchronisation,
  * normal file I/O and network I/O,
  * interval timing and calendar time,
  * basic memory management (malloc and free),
  * shared library linking.
 .
 This Ubuntu-specific version is built using the the Firefox NSPR.
 You need this package to get includes and static libraries for building
 programs linked to NSPR.
 .
 See http://www.mozilla.org/docs/refList/refNSPR/ for more
 information about NSPR.