Compilation error with open sdk on jaikbroken iphone

Hello,
when i execute make i have this response
do you know what is the problem ?
thks

Code:

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/workspace/Accelerometer root# make
arm-apple-darwin9-gcc -c -I"/var/include"  -I"/usr/include"  -F"/System/Library/Frameworks"  -F"/System/Library/PrivateFrameworks"  -DDEBUG -Wall -std=c99 -DMAC_OS_X_VERSION_MAX_ALLOWED=1050 Classes/AppDelegate.m -o Classes/AppDelegate.o
arm-apple-darwin9-gcc -c -I"/var/include"  -I"/usr/include"  -F"/System/Library/Frameworks"  -F"/System/Library/PrivateFrameworks"  -DDEBUG -Wall -std=c99 -DMAC_OS_X_VERSION_MAX_ALLOWED=1050 Classes/GraphView.m -o Classes/GraphView.o
arm-apple-darwin9-gcc -c -I"/var/include"  -I"/usr/include"  -F"/System/Library/Frameworks"  -F"/System/Library/PrivateFrameworks"  -DDEBUG -Wall -std=c99 -DMAC_OS_X_VERSION_MAX_ALLOWED=1050 Classes/main.m -o Classes/main.o
arm-apple-darwin9-gcc -arch arm -lobjc  -framework CoreFoundation  -framework Foundation  -framework UIKit  -framework QuartzCore -framework CoreGraphics  -framework GraphicsServices  -framework CoreSurface  -L"/usr/lib" -F"/System/Library/Frameworks" -F"/System/Library/PrivateFrameworks" -bind_at_load -multiply_defined suppress -o Accelerometer Classes/AppDelegate.o Classes/GraphView.o Classes/main.o
ld: library not found for -lobjc
collect2: ld returned 1 exit status
make: *** [Accelerometer] Error 1

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