im trying to program a graphic interface in C and i get this errors
C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x130): undefined reference to `_GetStockObject@4'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x167): undefined reference to `_SelectObject@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x1f1): undefined reference to `_PlgBlt@40'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x20f): undefined reference to `_SelectObject@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x299): undefined reference to `_PlgBlt@40'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x2ee): undefined reference to `_TextOutA@20'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x30c): undefined reference to `_SelectObject@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x396): undefined reference to `_PlgBlt@40'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x3b4): undefined reference to `_SelectObject@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x43e): undefined reference to `_PlgBlt@40'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x493): undefined reference to `_TextOutA@20'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x4de): undefined reference to `_SetBkMode@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x520): undefined reference to `_TextOutA@20'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x536): undefined reference to `_SetBkMode@8'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x544): undefined reference to `_DeleteDC@4'
C:\Users\alex\Downloads\Digitos\Ppal.opal.c.text+0x7d3): undefined reference to `_GetStockObject@4'
C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x130): undefined reference to `_GetStockObject@4'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x167): undefined reference to `_SelectObject@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x1f1): undefined reference to `_PlgBlt@40'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x20f): undefined reference to `_SelectObject@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x299): undefined reference to `_PlgBlt@40'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x2ee): undefined reference to `_TextOutA@20'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x30c): undefined reference to `_SelectObject@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x396): undefined reference to `_PlgBlt@40'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x3b4): undefined reference to `_SelectObject@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x43e): undefined reference to `_PlgBlt@40'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x493): undefined reference to `_TextOutA@20'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x4de): undefined reference to `_SetBkMode@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x520): undefined reference to `_TextOutA@20'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x536): undefined reference to `_SetBkMode@8'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x544): undefined reference to `_DeleteDC@4'C:\Users\alex\Downloads\Digitos\Ppal.o
pal.c.text+0x7d3): undefined reference to `_GetStockObject@4'