安装某些软件包时出现以下配置错误。我正在使用 ubantu 64 位机器并安装了免费的半径包，但错误仍然存在。
$:/tmp/rlm_protobuf-freeradius-2.1.x$ sudo ./configure
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for ranlib... ranlib
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking whether make sets $(MAKE)... yes
checking for curl-config... /usr/bin/curl-config
checking for curl >= 7.18.2... yes
checking CURL_CFLAGS...
checking CURL_LIBS... -L/usr/lib/x86_64-linux-gnu -lcurl -Wl,-Bsymbolic-functions -Wl,-z,relro
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking freeradius-devel/radius.h usability... no
checking freeradius-devel/radius.h presence... no
checking for freeradius-devel/radius.h... no
checking freeradius-devel/radiusd.h usability... no
checking freeradius-devel/radiusd.h presence... no
checking for freeradius-devel/radiusd.h... no
configure: error: "freeradius headers not found"