Missing library dependencies compiling app with importC

[DUser]

On Thursday, 22 February 2024 at 01:23:36 UTC, ptcute wrote:
> ...
> So what's the real issue behind?
>
> Anyone help on this would be appreciated.

They are MSVC compiler intrinsics. 
(https://issues.dlang.org/show_bug.cgi?id=23894)

Surprisingly I got it working by just replacing some includes 
with definitions in "curl/curl.h".

Change:

```c
#if defined(_WIN32) && !defined(_WIN32_WCE) && 
!defined(__CYGWIN__)
#if !(defined(_WINSOCKAPI_) || defined(_WINSOCK_H) || \
       defined(__LWIP_OPT_H__) || defined(LWIP_HDR_OPT_H))
/* The check above prevents the winsock2 inclusion if winsock.h 
already was
    included, since they can't co-exist without problems */
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
```
to:
```c
#if defined(_WIN32) && !defined(_WIN32_WCE) && 
!defined(__CYGWIN__)
#if !(defined(_WINSOCKAPI_) || defined(_WINSOCK_H) || \
       defined(__LWIP_OPT_H__) || defined(LWIP_HDR_OPT_H))
typedef unsigned short  u_short;
typedef unsigned int    u_int;

typedef struct sockaddr {
#if (_WIN32_WINNT < 0x0600)
     u_short sa_family;
#else
     ADDRESS_FAMILY sa_family;           // Address family.
#endif //(_WIN32_WINNT < 0x0600)
     char sa_data[14];                   // Up to 14 bytes of 
direct address.
} SOCKADDR;

#if(_WIN32_WINNT >= 0x0501)
typedef unsigned __int64 u_int64;
#endif //(_WIN32_WINNT >= 0x0501)

#if  defined(_WIN64)
typedef unsigned __int64 SOCKET;
#else
typedef unsigned int SOCKET;
#endif

#ifndef FD_SETSIZE
#define FD_SETSIZE      64
#endif /* FD_SETSIZE */

typedef struct fd_set {
         u_int fd_count;               /* how many are SET? */
         SOCKET  fd_array[FD_SETSIZE];   /* an array of SOCKETs */
} fd_set;
#endif
#endif
```
At least this example program 
(https://curl.se/libcurl/c/getinfo.html) works fine.