diff --git a/package/glog/Config.in b/package/glog/Config.in
index bbdd1e2151..85873f02f0 100644
--- a/package/glog/Config.in
+++ b/package/glog/Config.in
@@ -2,11 +2,13 @@ config BR2_PACKAGE_GLOG
 	bool "glog"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_6 # C++14
 	help
 	  C++ implementation of the Google logging module
 
 	  https://github.com/google/glog
 
-comment "glog needs a toolchain w/ C++, threads"
+comment "glog needs a toolchain w/ C++, threads, gcc >= 6"
 	depends on !BR2_INSTALL_LIBSTDCPP || \
-		!BR2_TOOLCHAIN_HAS_THREADS
+		!BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_6
diff --git a/package/opencv4-contrib/Config.in b/package/opencv4-contrib/Config.in
index 261d414869..d992c6d1ac 100644
--- a/package/opencv4-contrib/Config.in
+++ b/package/opencv4-contrib/Config.in
@@ -251,6 +251,7 @@ config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_SALIENCY
 
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_SFM
 	bool "sfm"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_6 # glog
 	select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
 	select BR2_PACKAGE_OPENCV4_LIB_IMGCODECS
 	select BR2_PACKAGE_EIGEN
@@ -261,6 +262,9 @@ config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_SFM
 	  to perform 3d reconstruction from 2d images. The core of
 	  the module is a light version of Libmv.
 
+comment "sfm needs a toolchain w/ gcc >= 6"
+	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_6
+
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_SHAPE
 	bool "shape"
 	help