This is the OpenWrt (19.07.5) SDK for NanoPi R4S (FriendlyARM). It contains the toolchain with: * openssl 1.1.1g * zlib 1.2.11 * curl 7.66 * mbedtls If you want to build with rust, pass '-Wl,-dynamic-linker,/lib/ld-musl-aarch64.so.1' to cargo's link-arg. Libcurl was linked with mbedtls. LibOpenSSL was linked with libgcc_s.so and libc.so