# value of a shell variable ac_cv_header_foo_h. The value should be
# yes if the header is deemed to exist, no otherwise. Or it could be
# something else, if the value computed by 'configure' requires that.
-# In general, since configure instructs GCC to use header files
-# in nt/inc, you should not need to futz with header file tests. But
-# there are exceptions, like with getopt.h below (which is a MinGW
-# system header, but we do not want to use it).
+# In general, since configure (when invoked from an MSYS environment)
+# instructs GCC to use header files in nt/inc, you should not need to
+# futz with header file tests. But there are exceptions, like with
+# getopt.h below (which is a MinGW system header, but we do not want
+# to use it).
#
# For each library function foo you want to supply test results, set
# the value of a shell variable ac_cv_func_foo. Again, the value is