CMake is not finding a usable cc on my cygwin system, I've tried many things.

Sat Jul 19 22:16:34 GMT 2025

I wrote:
CMake Error at CMakeLists.txt:107 (math):
 math cannot parse the expression: " * 8": syntax error, unexpected
 exp_TIMES (2).
-- ERROR-bit build (i386)
-- CMAKE_INSTALL_PREFIX = /opt/libjpeg-turbo
-- CMAKE_INSTALL_BINDIR = bin (/opt/libjpeg-turbo/bin)
-- CMAKE_INSTALL_DATAROOTDIR = (/opt/libjpeg-turbo)
-- CMAKE_INSTALL_DOCDIR = doc (/opt/libjpeg-turbo/doc)
-- CMAKE_INSTALL_INCLUDEDIR = include (/opt/libjpeg-turbo/include)
-- CMAKE_INSTALL_LIBDIR = lib32 (/opt/libjpeg-turbo/lib32)
-- CMAKE_INSTALL_MANDIR = man (/opt/libjpeg-turbo/man)
I'm going to ask for more help about CMake. Does anyone know how to
use these variables / macros / whatevers? I will try the documentation
when I can, getting tired today (I've been ill). I want to install to
/usr/local/ so, it looks like CMAKE_INSTALL_PREFIX =
/usr/local/libjpeg-turbo would do it if I knew how and when to tell
cmake about that. Thanks.
-- 
Soren