When compiling interrupt error

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Launching the compiler...
C:\Program Files (x86)\Flowcode\Common\Compilers\avr\batchfiles\avra.bat atmega8 "C:\Users\RAB\Desktop\@\4x4_7seg_2.elf" "C:\Users\RAB\Desktop\@\4x4_7seg_2.c" "C:\Users\RAB\Desktop\@\4x4_7seg_2.lst"
C:\Users\RAB\Desktop\@>"C:\PROGRA~2\Flowcode\Common\COMPIL~1\avr\BATCHF~1\..\bin\avr-gcc.exe" -mmcu=atmega8 -Os -ffunction-sections -fdata-sections -funsigned-char -o "C:\Users\RAB\Desktop\@\4x4_7seg_2.elf" "C:\Users\RAB\Desktop\@\4x4_7seg_2.c" -lm -Wl,-gc-sections
In file included from C:\ProgramData\MatrixTSL\FlowcodeV8\CAL\internals.c:372,
from C:\Users\RAB\Desktop\@\4x4_7seg_2.c:41:
C:\ProgramData\MatrixTSL\FlowcodeV8\CAL\/AVR\AVR_CAL_Delay.c:84:4: warning: #warning "Your clock speed is too low for Microsecond delays to be calculated accurately"
C:\Users\RAB\Desktop\@\4x4_7seg_2.c: In function 'main':
C:\Users\RAB\Desktop\@\4x4_7seg_2.c:375: error: 'TCCR2B' undeclared (first use in this function)
C:\Users\RAB\Desktop\@\4x4_7seg_2.c:375: error: (Each undeclared identifier is reported only once
C:\Users\RAB\Desktop\@\4x4_7seg_2.c:375: error: for each function it appears in.)
Error returned from [avr-gcc.exe]
C:\Program Files (x86)\Flowcode\Common\Compilers\avr\batchfiles\avra.bat reported error code 1
FINISHED"