diff --git a/depends/packages/bdb.mk b/depends/packages/bdb.mk
index 341cabf53..06613e45f 100644
--- a/depends/packages/bdb.mk
+++ b/depends/packages/bdb.mk
@@ -1,36 +1,36 @@
 package=bdb
 $(package)_version=5.3.28
 $(package)_download_path=https://download.oracle.com/berkeley-db
 $(package)_file_name=db-$($(package)_version).NC.tar.gz
 $(package)_sha256_hash=76a25560d9e52a198d37a31440fd07632b5f1f8f9f2b6d5438f4bc3e7c9013ef
 $(package)_build_subdir=build_unix
 $(package)_patches=clang_cxx_11.patch
 $(package)_patches+=winioctl.patch
 
 define $(package)_set_vars
 $(package)_config_opts=--disable-shared --enable-cxx --disable-replication --enable-option-checking
 $(package)_config_opts_mingw32=--enable-mingw
 $(package)_config_opts_linux=--with-pic
-$(package)_cxxflags=-std=c++17
+$(package)_cxxflags+=-std=c++17
 $(package)_cppflags_mingw32=-DUNICODE -D_UNICODE
 endef
 
 define $(package)_preprocess_cmds
   cd src &&\
   patch -p1 < $($(package)_patch_dir)/clang_cxx_11.patch && \
   patch -p1 < $($(package)_patch_dir)/winioctl.patch && \
   cd .. &&\
   cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub dist
 endef
 
 define $(package)_config_cmds
   ../dist/$($(package)_autoconf)
 endef
 
 define $(package)_build_cmds
   $(MAKE) -j$(JOBS) libdb_cxx-5.3.a libdb-5.3.a
 endef
 
 define $(package)_stage_cmds
   $(MAKE) DESTDIR=$($(package)_staging_dir) install_lib install_include
 endef
diff --git a/depends/packages/boost.mk b/depends/packages/boost.mk
index 408ec5e59..76e15f9fa 100644
--- a/depends/packages/boost.mk
+++ b/depends/packages/boost.mk
@@ -1,43 +1,43 @@
 package=boost
 $(package)_version=1_71_0
 $(package)_download_path=https://boostorg.jfrog.io/artifactory/main/release/$(subst _,.,$($(package)_version))/source/
 $(package)_file_name=boost_$($(package)_version).tar.bz2
 $(package)_sha256_hash=d73a8da01e8bf8c7eda40b4c84915071a8c8a0df4a6734537ddde4a8580524ee
 $(package)_dependencies=native_b2
 
 define $(package)_set_vars
 $(package)_config_opts_release=variant=release
 $(package)_config_opts_debug=variant=debug
 $(package)_config_opts=--layout=tagged --build-type=complete --user-config=user-config.jam
 $(package)_config_opts+=threading=multi link=static -sNO_COMPRESSION=1
 $(package)_config_opts_linux=target-os=linux threadapi=pthread runtime-link=shared
 $(package)_config_opts_darwin=target-os=darwin runtime-link=shared
 $(package)_config_opts_mingw32=target-os=windows binary-format=pe threadapi=win32 runtime-link=static
 $(package)_config_opts_x86_64=architecture=x86 address-model=64
 $(package)_config_opts_i686=architecture=x86 address-model=32
 $(package)_config_opts_aarch64=address-model=64
 ifneq (,$(findstring clang,$($(package)_cxx)))
 $(package)_toolset_$(host_os)=clang
 else
 $(package)_toolset_$(host_os)=gcc
 endif
 $(package)_config_libraries=atomic,date_time,test
-$(package)_cxxflags=-std=c++17 -fvisibility=hidden
+$(package)_cxxflags+=-std=c++17 -fvisibility=hidden
 $(package)_cxxflags_linux=-fPIC
 endef
 
 define $(package)_preprocess_cmds
   echo "using $($(package)_toolset_$(host_os)) : : $($(package)_cxx) : <cflags>\"$($(package)_cflags)\" <cxxflags>\"$($(package)_cxxflags)\" <compileflags>\"$($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$($(package)_ar)\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
 endef
 
 define $(package)_config_cmds
   ./bootstrap.sh --without-icu --with-libraries=$($(package)_config_libraries) --with-toolset=$($(package)_toolset_$(host_os)) --with-bjam=b2
 endef
 
 define $(package)_build_cmds
   b2 -d2 -j$(JOBS) -d1 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) toolset=$($(package)_toolset_$(host_os)) stage
 endef
 
 define $(package)_stage_cmds
   b2 -d0 -j4 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) toolset=$($(package)_toolset_$(host_os)) install
 endef
diff --git a/depends/packages/protobuf.mk b/depends/packages/protobuf.mk
index 27b2c5170..646007704 100644
--- a/depends/packages/protobuf.mk
+++ b/depends/packages/protobuf.mk
@@ -1,29 +1,29 @@
 package=protobuf
 $(package)_version=$(native_$(package)_version)
 $(package)_download_path=$(native_$(package)_download_path)
 $(package)_file_name=$(native_$(package)_file_name)
 $(package)_sha256_hash=$(native_$(package)_sha256_hash)
 $(package)_dependencies=native_$(package)
-$(package)_cxxflags=-std=c++11
+$(package)_cxxflags+=-std=c++17
 
 define $(package)_set_vars
   $(package)_config_opts=--disable-shared --with-protoc=$(build_prefix)/bin/protoc --disable-dependency-tracking
   $(package)_config_opts_linux=--with-pic
 endef
 
 define $(package)_config_cmds
   $($(package)_autoconf)
 endef
 
 define $(package)_build_cmds
   $(MAKE) -j$(JOBS) -C src libprotobuf.la
 endef
 
 define $(package)_stage_cmds
   $(MAKE) DESTDIR=$($(package)_staging_dir) -C src install-libLTLIBRARIES install-nobase_includeHEADERS &&\
   $(MAKE) DESTDIR=$($(package)_staging_dir) install-pkgconfigDATA
 endef
 
 define $(package)_postprocess_cmds
   rm lib/libprotoc.a lib/*.la
 endef
diff --git a/depends/packages/zeromq.mk b/depends/packages/zeromq.mk
index e119453b0..c1d2e2873 100644
--- a/depends/packages/zeromq.mk
+++ b/depends/packages/zeromq.mk
@@ -1,35 +1,35 @@
 package=zeromq
 $(package)_version=4.3.1
 $(package)_download_path=https://github.com/zeromq/libzmq/releases/download/v$($(package)_version)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=bcbabe1e2c7d0eec4ed612e10b94b112dd5f06fcefa994a0c79a45d835cd21eb
 $(package)_patches=remove_libstd_link.patch
 
 define $(package)_set_vars
   $(package)_config_opts=--without-docs --disable-shared --disable-curve --disable-curve-keygen --disable-perf
   $(package)_config_opts += --without-libsodium --without-libgssapi_krb5 --without-pgm --without-norm --without-vmci
   $(package)_config_opts += --disable-libunwind --disable-radix-tree --without-gcov --disable-dependency-tracking
   $(package)_config_opts += --disable-Werror --disable-drafts --enable-option-checking
   $(package)_config_opts_linux=--with-pic
-  $(package)_cxxflags=-std=c++17
+  $(package)_cxxflags+=-std=c++17
 endef
 
 define $(package)_preprocess_cmds
   patch -p1 < $($(package)_patch_dir)/remove_libstd_link.patch
 endef
 
 define $(package)_config_cmds
   $($(package)_autoconf)
 endef
 
 define $(package)_build_cmds
   $(MAKE) -j$(JOBS) src/libzmq.la
 endef
 
 define $(package)_stage_cmds
   $(MAKE) DESTDIR=$($(package)_staging_dir) install-libLTLIBRARIES install-includeHEADERS install-pkgconfigDATA
 endef
 
 define $(package)_postprocess_cmds
   rm -rf bin share lib/*.la
 endef