Source: Johannes (@jnbr)
Upstream: no

--- tools/lemon/CMakeLists.txt	2019-02-28 18:56:38.000000000 +0100
+++ tools/lemon/CMakeLists.txt	2019-03-11 20:41:14.211616335 +0100
@@ -7,6 +7,14 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 #

+if(CMAKE_CROSSCOMPILING)
+	add_custom_target(
+		lemon
+		COMMAND $ENV{CC_FOR_BUILD} -o ${EXECUTABLE_OUTPUT_PATH}/lemon ${CMAKE_CURRENT_SOURCE_DIR}/lemon.c
+		COMMENT "generate lemon for host"
+	)
+else()
+
 add_executable(lemon lemon.c)

 # To keep lemon.c as close to upstream as possible, deliberately ignore
@@ -62,6 +70,7 @@
 endif()
 target_compile_options(lemon PRIVATE ${lemon_cflags})

+endif() # CMAKE_CROSSCOMPILING
 #
 # Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 #

--- cmake/modules/UseLemon.cmake	2019-02-28 18:56:38.000000000 +0100
+++ cmake/modules/UseLemon.cmake	2019-03-11 21:19:28.352163076 +0100
@@ -13,7 +13,7 @@
           # These files are generated as side-effect
           ${_out}.h
           ${_out}.out
-         COMMAND lemon
+         COMMAND ${EXECUTABLE_OUTPUT_PATH}/lemon
            -T${_lemonpardir}/lempar.c
            -d.
            ${_in}