Fix gcc coupler

See merge request nexedi/slapos!1551

software/osie-coupler/software.cfg

 [buildout]
 parts =
+  gcc-10.2
   open62541
   compile-coupler
   slapos-cookbook
@@ -11,6 +12,7 @@ extends =
   ../../component/open62541/buildout.cfg
   ../../stack/monitor/buildout.cfg
   ../../stack/slapos.cfg
+  ../../component/gcc/buildout.cfg
 
 # disable warning for time_t type structure after 2038
 # https://www.gnu.org/software/gnulib/manual/html_node/Avoiding-the-year-2038-problem.html
@@ -60,6 +62,7 @@ recipe = slapos.recipe.cmmi
 path = ${osie-repository:location}/coupler
 bin_dir = ${:path}/bin/
 environment =
+  PATH=${gcc-10.2:location}/bin:/usr/bin
   OPEN62541_HOME = ${open62541:location}
   OPEN62541_SOURCE_HOME = ${open62541-source:location}
   C_COMPILER_EXTRA_FLAGS = -L ${mbedtls:location}/lib -Wl,-rpath=${mbedtls:location}/lib -l:libopen62541.so -L${open62541:location}/lib -Wl,-rpath=${open62541:location}/lib -I${open62541:location}/include -I${open62541-source:location}/src/pubsub/ -I${open62541-source:location}/deps