recipe for target 'Project1.exe' failed

Question

I try to compile a simple c file in Dev-C++ and it shows an error on line 25 C:\Users\varun\Desktop\cprog\Makefile.win recipe for target 'Project1.exe' failed.

Makefile.win

# Project: Project1
# Makefile created by Dev-C++ 5.6.2

CPP      = g++.exe
CC       = gcc.exe
WINDRES  = windres.exe
OBJ      = main.o Untitled2.o
LINKOBJ  = main.o Untitled2.o
LIBS     = -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib" -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/lib" -static-libgcc
INCS     = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include"
CXXINCS  = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include/c++"
BIN      = Project1.exe
CXXFLAGS = $(CXXINCS) 
CFLAGS   = $(INCS) 
RM       = rm.exe -f

.PHONY: all all-before all-after clean clean-custom

all: all-before $(BIN) all-after

clean: clean-custom
    ${RM} $(OBJ) $(BIN)

$(BIN): $(OBJ)
    **$(CC) $(LINKOBJ) -o $(BIN) $(LIBS)**

main.o: main.c
    $(CC) -c main.c -o main.o $(CFLAGS)

Untitled2.o: Untitled2.c
    $(CC) -c Untitled2.c -o Untitled2.o $(CFLAGS)

Errors

C:\Users\varun\Desktop\cprog\Untitled2.o    Untitled2.c:(.text+0x0): multiple definition of `main'
C:\Users\varun\Desktop\cprog\main.o main.c:(.text+0x0): first defined here
C:\Users\varun\Desktop\cprog\collect2.exe   [Error] ld returned 1 exit status
25      C:\Users\varun\Desktop\cprog\Makefile.win   recipe for target 'Project1.exe' failed

Solution

The important bit of the output is:

C:\Users\varun\Desktop\cprog\Untitled2.o    Untitled2.c:(.text+0x0): multiple definition of `main'

It tells you, that you have two definitions of function main. You need exactly one such definition in an executable. The next line of the error tells you, where that definition is:

C:\Users\varun\Desktop\cprog\main.o main.c:(.text+0x0): first defined here

So you have function main defined in Untitled2.c and you have another function main defined in main.c. Delete one of them. From the names perhaps the main.c is unnecessary altogether, but I can't tell without seeing the files.