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I installed the VASP version 5.2, but got the following error:

".........
fortcom: Error: radial.f90, line 1282: This name does not have a type, and must have an explicit type. [ISGGA]
IF (ISGGA()) LLMAX=LLMAX+1
----------^
fortcom: Error: radial.f90, line 1282: A logical data type is required in this context. [ISGGA]
IF (ISGGA()) LLMAX=LLMAX+1
----------^
fortcom: Error: radial.f90, line 1404: A logical data type is required in this context. [ISGGA]
gga: IF (ISGGA()) THEN
------------------^
fortcom: Error: radial.f90, line 2657: This name does not have a type, and must have an explicit type. [ISGGA]
IF (ISGGA()) THEN
----------^
fortcom: Error: radial.f90, line 2657: A logical data type is required in this context. [ISGGA]
IF (ISGGA()) THEN
----------^
compilation aborted for radial.f90 (code 1)
make: *** [radial.o] Error 1"

Please give me technical guidelines to solve this problem.
Thanks.

O. P. Vu

ISGGA is a function in included xclib and should be available at the stage at which radial.f90 is compiled. Please check in your makefile (SOURCE)
whether xclib is compiled BEFORE radial