ImageMagick build error

[Mayuresh <mayuresh%acm.org@localhost>]

In file included from coders/pdf.c:90:0:
./coders/ghostscript-private.h: In function 'InvokeGhostscriptDelegate':                                                               
./coders/ghostscript-private.h:136:5: error: 'gsapi_set_arg_encoding'
undeclared (first use in this function); did you mean 'gsapi_set_stdio'?
     gsapi_set_arg_encoding;
     ^~~~~~~~~~~~~~~~~~~~~~
     gsapi_set_stdio


Any relation with this [1] thread which says ghostscipt needs to be
upgraded to version 9.19 to 9.21

[1] https://github.com/NickNaso/ghostscript4js/issues/25

-- 
Mayuresh