Another try

Makefile

@@ -19,11 +19,9 @@ dep_cowlib = git https://github.com/ninenines/cowlib qpack
 dep_ranch = git https://github.com/ninenines/ranch 1.8.0
 
 ifdef COWBOY_QUICER
-ifneq ($(PLATFORM),msys2)
 DEPS += quicer
 dep_quicer = git https://github.com/emqx/quic main
 endif
-endif
 
 DOC_DEPS = asciideck
 
@@ -63,10 +61,11 @@ ifndef FULL
 CT_SUITES := $(filter-out examples ws_autobahn,$(CT_SUITES))
 endif
 
-# Don't run HTTP/3 test suites on Windows.
+# Don't run HTTP/3 test suites on Windows or depend on quicer.
 
 ifeq ($(PLATFORM),msys2)
 CT_SUITES := $(filter-out rfc9114 rfc9204 rfc9220,$(CT_SUITES))
+DEPS := $(filter-out quicer,$(DEPS))
 endif
 
 # Compile options.