diff --git a/rules.mk b/rules.mk
index 81517279..8cf09464 100644
--- a/rules.mk
+++ b/rules.mk
@@ -15,7 +15,7 @@ PKG = $(shell perl -ne 'print $$1 if /Package:\s+((\w+[-\.]?)+)/;' DESCRIPTION)
 VERSION = $(shell perl -ne 'print $$1 if /Version:\s+((\d+[-\.]?)+)/;' DESCRIPTION)
 PKGVERS = $(PKG)_$(VERSION)
 TARBALL = $(PKGVERS).tar.gz
-SOURCE = $(sort $(wildcard R/*R src/*.c src/*.h data/* examples/*))
+SOURCE = $(sort $(wildcard R/*R src/*.c src/*.cc src/*.h data/* examples/*))
 CSOURCE = $(sort $(wildcard src/*.c))
 TESTS = $(sort $(wildcard tests/*R))
 INSTDOCS = $(sort $(wildcard inst/doc/*))
@@ -58,8 +58,7 @@ qcheck: CHECK = devtools::check($(COMMON_CHECK_ARGS),cran=FALSE,\
 args=c("--no-tests"))
 qqcheck: CHECK = devtools::check($(COMMON_CHECK_ARGS),cran=FALSE,\
 args=c("--no-tests","--no-codoc","--no-examples"))
-xcheck: CHECK = devtools::check($(COMMON_CHECK_ARGS),cran=TRUE,\
-env_vars=c("_R_CHECK_DEPENDS_ONLY_"="TRUE"))
+xcheck: CHECK = devtools::check($(COMMON_CHECK_ARGS),cran=TRUE)
 ycheck: CHECK = devtools::check($(COMMON_CHECK_ARGS),cran=TRUE,\
 args=c("--run-dontrun","--run-donttest"))
 
diff --git a/tools/check.env b/tools/check.env
index a2004121..95ee1c45 100644
--- a/tools/check.env
+++ b/tools/check.env
@@ -20,6 +20,7 @@ _R_CHECK_COMPILATION_FLAGS_=true
 _R_CHECK_CONNECTIONS_LEFT_OPEN_=true
 _R_CHECK_CRAN_INCOMING_=false
 _R_CHECK_DATALIST_=true
+_R_CHECK_DEPENDS_ONLY_=false
 _R_CHECK_DEPRECATED_DEFUNCT_=true
 _R_CHECK_DONTTEST_EXAMPLES_=false
 _R_CHECK_DOT_FIRSTLIB_=true
@@ -39,6 +40,7 @@ _R_CHECK_LENGTH_1_CONDITION_ =package:_R_CHECK_PACKAGE_NAME_
 _R_CHECK_LENGTH_1_LOGIC2_=package:_R_CHECK_PACKAGE_NAME_,abort,verbose
 _R_CHECK_LICENSE_=true
 _R_CHECK_LIMIT_CORES_=true
+_R_CHECK_RD_MATH_RENDERING_=true
 _R_CHECK_MATRIX_DATA_=true
 _R_CHECK_NATIVE_ROUTINE_REGISTRATION_=true
 _R_CHECK_NO_RECOMMENDED_=true