Attempting to build against a C SLALIB library: -L/usr/local/lib -lsla Checking if your kit is complete... Looks good Note (probably harmless): No library found for '-lsla' Note (probably harmless): No library found for '-lm' Note (probably harmless): No library found for 'oldnames.lib' Note (probably harmless): No library found for 'msvcrt.lib' Writing Makefile for Astro::SLA Microsoft (R) Program Maintenance Utility Version 6.00.8168.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cp SLA.pm blib\lib\Astro\SLA.pm D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\lib D:\cpanrun\build\5-6-1\lib\ExtUtils/xsubpp -typemap D:\cpanrun\build\5-6-1\lib\ExtUtils\typemap -typemap typemap SLA.xs > SLA.xsc && D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\lib -MExtUtils::Command -e mv SLA.xsc SLA.c cl -c -I/usr/local/include -nologo -O1 -MD -Zi -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX -O1 -MD -Zi -DNDEBUG -DVERSION=\"0.99\" -DXS_VERSION=\"0.99\" -ID:\cpanrun\build\5-6-1\lib\CORE SLA.c SLA.c D:\cpanrun\build\5-6-1\lib\CORE\perl.h(441) : fatal error C1083: Cannot open include file: 'sys/types.h': No such file or directory NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop.