c - Error while compiling and linking dll -

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I am trying to compile the following simple DLL. I have been successful in doing everything successfully, but the last step When I execute the command: 

  gcc-o Maiprog myprog.c -l./ -lmydll   
 me say it gives an error that  Hello ()  has not been declared in the area I was unable to follow the tutorial verbatim, even though I compiled yet simple project I and why I am so why lose.  
 The code for individual files is as follows:  
 (myprog .c)  
  int main (zero) {hello (); }   
 (mydll.c)  
  #include & lt; Stdio.h & gt; Int Hello () {printf ("Hello World! \ N"); Return 0; }    
 
 
 The example is working fine for me in my signin  < pre>  armathew @ 3NJ2VQ1 / cygdrive / d / userdata / armathew / desktop / WWWW $ ls mydll.c myprog.c armathew @ 3NJ2VQ1 / cygdrive / d / userdata / armathew / desktop / WWWW $ gcc -c mydll.c armathew @ 3 NJ 2 VQ-1 / Saigraiv / D / Ughrdeta / Armthu / desktop / Dbludbludbludblu $ GCC -sear O Maidel Dial Maidelko Armethv @ 3 NJ 2 VQ-1 / Saigrediv / D / Ugrdata / Armethu / desktop / Double Udbludbludblu $ gcc -o Mayprog Mayprog. - L. / -LMDL Armheave @ 3 NJ2VQ1 / Cyndreid / D / Usager / Armuitu / Desktop / WWW $ ./myprog.exe Hello World!   
 What is the saver version you are using? I 1.7.5  
  armathew @ 3NJ2VQ1 / cygdrive / d / userdata / armathew / desktop / WWWW $ uname -r 1.7.5 (0.225 / 5/3)

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