Please try setting DEB_BUILD_OPTIONS=parallel=1 in debian/rules for the packages that fail to build,and report back whether this fixes the issue.
Thanks. -- أحمد المحمودي (Ahmed El-Mahmoudy) Digital design engineer GPG KeyIDs: 4096R/A7EF5671 2048R/EDDDA1B7 GPG Fingerprints: 6E2E E4BB 72E2 F417 D066 6ABF 7B30 B496 A7EF 5761 8206 A196 2084 7E6D 0DF8 B176 BC19 6A94 EDDD A1B7
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