Fix linux

Author: savannahostrowski

Makefile.pre.in

@@ -3152,7 +3152,7 @@ else ifeq ($(HOST_GNU_TYPE), i686-pc-windows-msvc)
 JIT_STENCIL_HEADER = jit_stencils-i686-pc-windows-msvc.h
 else ifeq ($(HOST_GNU_TYPE), x86_64-pc-windows-msvc)
 JIT_STENCIL_HEADER = jit_stencils-x86_64-pc-windows-msvc.h
-else ifneq ($(filter x86_64-unknown-linux-gnu,$(HOST_GNU_TYPE)),)
+else ifeq ($(HOST_GNU_TYPE), x86_64-unknown-linux-gnu)
 JIT_STENCIL_HEADER = jit_stencils-x86_64-unknown-linux-gnu.h
 else
 $(error "Unsupported host triple: $(HOST_GNU_TYPE).")