On 2019-12-09 09:37, Darafei "Komяpa" Praliaskouski wrote:
When I install
http://ftp.mgts.by/debian/pool/main/s/sfcgal/libsfcgal1_1.3.7-4_amd64.deb I
get the following error message in PostGIS:

ERROR:  XX000: could not load library
"/usr/lib/postgresql/11/lib/postgis-3.so":
/usr/lib/x86_64-linux-gnu/libSFCGAL.so.1: undefined symbol:
_ZlsRSoPK12__mpz_struct

With 1.3.7-2 it works okay. Seems 1.3.7-4 for some reason does not pull in
CGAL?

CGAL is a header-only library since 5.0.

SFCGAL needed several patches to work with that, and postgis still needs to be rebuilt with the new sfcgal.

postgis (3.0.0+dfsg-5) in unstable has SFCGAL support disabled, the next upload (once cgal & sfcgal have migrated to testing) will enable it again.

You're not using the packages from unstable since you're still using PG11, so I cannot help you further.

Kind Regards,

Bas

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