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root@Eta:~/libudns# ./configure --disable-assert
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 whether gcc understands -c and -o together... yes
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /bin/grep
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checking for ANSI C header files... yes
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checking minix/config.h usability... no
checking minix/config.h presence... no
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checking whether build environment is sane... yes
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checking dynamic linker characteristics... GNU/Linux ld.so
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configure: creating ./config.status
config.status: creating Makefile
config.status: creating config.h
config.status: executing depfiles commands
config.status: executing libtool commands
root@Eta:~/libudns# make
make  all-am
make[1]: Entering directory '/root/libudns'
  CC       udns_dn.lo
  CC       udns_dntosp.lo
  CC       udns_parse.lo
  CC       udns_resolver.lo
  CC       udns_init.lo
  CC       udns_misc.lo
  CC       udns_XtoX.lo
udns_XtoX.c:47:58: fatal error: winsock2.h: No such file or directory
 #include <winsock2.h>          /* includes <windows.h> */
                                                          ^
compilation terminated.
Makefile:484: recipe for target 'udns_XtoX.lo' failed
make[1]: *** [udns_XtoX.lo] Error 1
make[1]: Leaving directory '/root/libudns'
Makefile:352: recipe for target 'all' failed
make: *** [all] Error 2
root@Eta:~/libudns#

➜  tests clang -ludns main.c 
main.c:11:20: error: variable has incomplete type 'struct dns_ctx'
    struct dns_ctx dc;
                   ^
/usr/include/udns.h:64:8: note: forward declaration of 'struct dns_ctx'
struct dns_ctx;
       ^
1 error generated.

a.out: udns_resolver.c:457: dns_new: Assertion `CTXINITED(copy)' failed.
[1]    28554 abort (core dumped)  ./a.out

checking for malloc... yes
checking for memset... (cached) yes
checking for socket... yes
checking udns.h usability... no
checking udns.h presence... no
checking for udns.h... no
configure: error: Couldn't find libudns. Try installing libudns-dev or udns-devel.
Makefile:85: recipe for target '/home/hqo/source/build_dir/target-mips_24kc_musl-1.1.16/shadowsocks-libev/openssl/shadowsocks-libev-2017-01-25/.configured_yyyyyyy' failed