openwrt 21.02.3 x86_64
compile errors is as following:
[ 66%] Linking C executable netopeer2-server
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: CMakeFiles/serverobj.dir/src/common.c.o: in function `url_open':
common.c:(.text+0x72): undefined reference to `curl_global_init'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x78): undefined reference to `curl_easy_init'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x8e): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xa3): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xb8): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xcd): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xd6): undefined reference to `curl_easy_perform'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xf1): undefined reference to `curl_easy_cleanup'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0xf7): undefined reference to `curl_global_cleanup'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: CMakeFiles/serverobj.dir/src/common.c.o: in function `np2srv_url_setcap':
common.c:(.text+0xf12): undefined reference to `curl_version_info'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: CMakeFiles/serverobj.dir/src/common.c.o: in function `op_export_url':
common.c:(.text+0x118b): undefined reference to `curl_global_init'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x1191): undefined reference to `curl_easy_init'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x11a7): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x11bc): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x11d1): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x11e6): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: common.c:(.text+0x11fb): undefined reference to `curl_easy_setopt'
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: CMakeFiles/serverobj.dir/src/common.c.o:common.c:(.text+0x1210): more undefined references to `curl_easy_setopt' follow
/home/openwrt_21_02_3_debug/staging_dir/toolchain-x86_64_gcc-8.4.0_musl/lib/gcc/x86_64-openwrt-linux-musl/8.4.0/../../../../x86_64-openwrt-linux-musl/bin/ld: CMakeFiles/serverobj.dir/src/common.c.o: in function `op_export_url':
common.c:(.text+0x1219): undefined reference to `curl_easy_perform'