Hi,
GNU Make does support dash "-" in the variable name.
vim nicely highlight variable names at setting time, but ignore
variables with a dash.
A patch is attached to fix that.
--
Jérôme
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diff -r b0a227941705 runtime/syntax/make.vim
--- a/runtime/syntax/make.vim Tue Feb 03 19:13:34 2015 +0100
+++ b/runtime/syntax/make.vim Wed Feb 04 17:26:37 2015 +0100
@@ -43,7 +43,7 @@
syn region makeIdent start="\${" skip="\\}\|\\\\" end="}" contains=makeStatement,makeIdent,makeSString,makeDString
syn match makeIdent "\$\$\w*"
syn match makeIdent "\$[^({]"
-syn match makeIdent "^ *\a\w*\s*[:+?!*]="me=e-2
+syn match makeIdent "^ *\a\%(\w\|-\)*\s*[:+?!*]="me=e-2
syn match makeIdent "^ *\a\w*\s*="me=e-1
syn match makeIdent "%"
