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A variable returns MINGW32_NT-5.1 or CYGWIN_NT-5.1. (yea, dot at the end)

Need to compare that given var contains NT-5.1 positioned anywhere.

Using cygwin and would like to be compatible with pretty much any *nix.

Searches in for an occurrence of find . If it occurs, the value is find ; otherwise, the value is empty. You can use this function in a conditional to test for the presence of a specific substring in a given string. Thus, the two examples,

$(findstring a,a b c)
$(findstring a,b c)
  
produce the values "a" and "" (the empty string), respectively. See Testing Flags, for a practical application of findstring.
Something like:
ifneq (,$(findstring NT-5.1,$(VARIABLE)))
    # Found
    # Not found
endif
  
What is the comma here for ifneq (,$(...?
Parse it as ifneq(A,B) where A is the empty string and B is $(findstring...). It looks odd because you don't quote strings in Makefiles.
                Is findstring case sensitive? If so, is there a simple way to do case insensitive matching?  The manual wasn't clear...
– Isaac Turner
                Feb 16, 2014 at 17:45
                @IsaacTurner: Yes, make functions are invariably case-sensitive. Sadly, there are no case-insensitive variants, but as a workaround you could use the $(shell ...) function to use a shell command for case conversion - clunky, but it works; e.g.: $(findstring $(shell echo 'BC' | tr '[:upper:]' '[:lower:]'), 'abcd'). If you don't mind specifying SHELL := bash to have make use bash as the shell, you can take advantage of shopt -s nocasematch and perform entire comparisons case-insensitively inside a single $(shell ...) call.
– mklement0
                Dec 1, 2014 at 18:27
                Shouldn't the if and else be reversed in you example? As I understand it, if findstring returns an empty string, the value was not found.
– szx
                Oct 4 at 19:57
                @szx Notice that this has ifneq rather than ifeq. If findstring does not return an empty string, then it found something. That's how I read it.
– John Kugelman
                Oct 4 at 23:25
        
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