I think this patch RCS file: /cvsroot/boost/boost/boost/lexical_cast.hpp,v ... revision 1.30 date: 2006/10/25 06:43:44; author: alnsn; state: Exp; lines: +276 -59 Optimization for floating types (1.25 faster on gcc / FreeBSD 6.2). VC6 test is still broken. Causes all these new failures (look for "error" in each of the build logs): http://cci.lbl.gov/misc_build/results/2006_10_27_1935/mac_os_10_3_build_log http://cci.lbl.gov/misc_build/results/2006_10_27_1935/redhat80_py25_build_lo... http://cci.lbl.gov/misc_build/results/2006_10_27_1935/redhat90_py25_build_lo... http://cci.lbl.gov/misc_build/results/2006_10_27_1935/redhat_ws3_py25_build_... http://cci.lbl.gov/misc_build/results/2006_10_27_1935/win_xp_vc71_py25_build... If this is not enough information to fix the bug, please let me know how I can help. BTW: It works on a number of other platforms: http://cci.lbl.gov/misc_build/show_error_summary.cgi?build_tag=2006_10_27_19... Thanks! Cheers, Ralf