undefined references when linking with static library with OTL using a makefile - c++

Question

I want to link my project to a static library (msodbcsql11.lib), and I want to include it's header (msodbcsql.h) and another header file of a framework otlv4.h) using a simple makefile, but it looks like it can't find the library. Here is my makefile:
CC=g++
LDFLAGS=
CFLAGS=-c -Wall
SOURCES=main.cpp
LIBB = C:\temp\lib
LIBINCL = C:\temp\include
CFLAGS += -I$(LIBINCL)
LDFLAGS += -L$(LIBB)
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=main
all: $(SOURCES) $(EXECUTABLE)
$(EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $#
.cpp.o:
$(CC) $(CFLAGS) $< -o $#
And here is my c++ code:
#include <iostream>
#define OTL_ODBC_MSSQL_2008 // Compile OTL 4/ODBC, MS SQL 2008
#include <otlv4.h>
int main(){
otl_connect db; //undefined reference errors
}
Here is the build when I declared otl_connect:
18:42:33 **** Incremental Build of configuration Default for project mak ****
make all
g++ -c -Wall -IC:\temp\include main.cpp -o main.o
g++ -LC:\temp\lib main.o -o main
main.o:main.cpp:(.text$_ZN8otl_connD1Ev[_ZN8otl_connD1Ev]+0x66): undefined reference to `SQLFreeHandle'
main.o:main.cpp:(.text$_ZN8otl_connD1Ev[_ZN8otl_connD1Ev]+0x66): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `SQLFreeHandle'
main.o:main.cpp:(.text$_ZN8otl_connD1Ev[_ZN8otl_connD1Ev]+0x9e): undefined reference to `SQLFreeHandle'
main.o:main.cpp:(.text$_ZN8otl_connD1Ev[_ZN8otl_connD1Ev]+0x9e): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `SQLFreeHandle'
main.o:main.cpp:(.text$_ZN8otl_conn6logoffEv[_ZN8otl_conn6logoffEv]+0x54): undefined reference to `SQLDisconnect'
main.o:main.cpp:(.text$_ZN8otl_conn6logoffEv[_ZN8otl_conn6logoffEv]+0x54): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `SQLDisconnect'
main.o:main.cpp:(.text$_ZN8otl_conn5errorER7otl_exc[_ZN8otl_conn5errorER7otl_exc]+0x70): undefined reference to `SQLGetDiagRec'
main.o:main.cpp:(.text$_ZN8otl_conn5errorER7otl_exc[_ZN8otl_conn5errorER7otl_exc]+0x70): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `SQLGetDiagRec'
main.o:main.cpp:(.text$_ZN8otl_conn6commitEv[_ZN8otl_conn6commitEv]+0x23): undefined reference to `SQLEndTran'
main.o:main.cpp:(.text$_ZN8otl_conn6commitEv[_ZN8otl_conn6commitEv]+0x23): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `SQLEndTran'
collect2: error: ld returned 1 exit status
makefile:14: recipe for target 'main' failed
make: *** [main] Error 1
18:42:35 Build Finished (took 1s.993ms)
What is wrong with my makefile? What should I do?
edit: I updated based on #Jonathan Wakely's answer:
LIBB = C:\temp\lib
LIBFILE = msodbcsql11
LDFLAGS += -L$(LIBB) -l$(LIBFILE)
I'm still getting the same errors
Update: Updated makefile as suggested by #Jonathan Wakely, but still getting errors. BTW, I changed the file format of libmsodbcsql11.lib to libmsodbcsql11.a because the compiler can't detect the .lib version
CC=g++
LDFLAGS=
CFLAGS=-c -Wall
SOURCES=main.cpp
LIBB = C:\temp\lib
LIBFILE = msodbcsql11
LIBINCL = C:\temp\include
CFLAGS += -I$(LIBINCL)
OBJECTS=$(SOURCES:.cpp=.o)
LDFLAGS += -L$(LIBB) -l$(LIBFILE)
EXECUTABLE=main
all: $(SOURCES) $(EXECUTABLE)
$(EXECUTABLE): $(OBJECTS)
$(CC) $(OBJECTS) $(LDFLAGS) -o $#
.cpp.o:
$(CC) $(CFLAGS) $< -o $#

Answer 1

The -L flag only tells the linker where to look for libraries, you need to use -l to tell it which library to link to.

Answer 2

This might be helpful...
Apparently the OTL library requires the odbc32.lib file to call ODBC functions. It's a little confusing because the microsoft ODBC driver have this msodbcsql11.lib, apparently it is not what's needed. Regardless the previous versions of my makefile did not call any library, so I accepted #Jonathan Wakely's answer.