Escaping parentheses in Makefile rule with bash <(curl ...)
The reason is because, you are not using the bash shell. Your makefile does not use the bourne again shell (bash) in which process substitution is supported(<()), so the system executes it with /bin/sh. The default /bin/sh bourne shell is designed to run only with standard features.
Use the SHELL := /bin/bash in your Makefile to make the bash shell by default for all the recipes, or you could define it per recipe.
foo: SHELL := /bin/bashfoo: docker run $(IMAGE_NAME) bash <(curl SOME_URL) \ --some-param1 \ --some-param2From GNU make documentation: Choosing the Shell. Quoting from it to show the actual lines
The program used as the shell is taken from the variable
SHELL. If this variable is not set in yourmakefile, the program/bin/shis used as the shell