diff -ur extra/cups-pdf.conf extra/cups-pdf.conf

--- extra/cups-pdf.conf	2021-06-03 08:50:00.109555813 -0400

+++ extra/cups-pdf.conf	2021-06-03 08:51:27.530198340 -0400

@@ -250,9 +250,9 @@

 ### Key: GSCall (config)

 ## command line for calling GhostScript (!!! DO NOT USE NEWLINES !!!)

 ## MacOSX: for using pstopdf set this to %s %s -o %s %s

-### Default: %s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f %s

+### Default: %s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c 30000000 setvmthreshold -f %s

-#GSCall %s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f %s

+#GSCall %s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c 30000000 setvmthreshold -f %s

 ### Key: PDFVer (config, ppd, lptopions)

 ##  PDF version to be created - can be "1.5", "1.4", "1.3" or "1.2" 

diff -ur src/cups-pdf.h src/cups-pdf.h

--- src/cups-pdf.h	2021-06-03 08:50:00.109555813 -0400

+++ src/cups-pdf.h	2021-06-03 08:51:44.833325511 -0400

@@ -58,7 +58,7 @@

   { "AnonDirName", SEC_CONF|SEC_PPD, { "/var/spool/cups-pdf/ANONYMOUS" } },

   { "AnonUser", SEC_CONF|SEC_PPD, { "nobody" } },

   { "GhostScript", SEC_CONF|SEC_PPD, { "/usr/bin/gs" } },

-  { "GSCall", SEC_CONF|SEC_PPD, { "%s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile=\"%s\" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f %s" } },

+  { "GSCall", SEC_CONF|SEC_PPD, { "%s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile=\"%s\" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c 30000000 setvmthreshold -f %s" } },

   { "Grp", SEC_CONF|SEC_PPD, { "lp" } },

   { "GSTmp", SEC_CONF|SEC_PPD, { "TMPDIR=/var/tmp" } },

   { "Log", SEC_CONF|SEC_PPD, { "/var/log/cups" } },