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LAPACK 3.4.1 does use some Fortran 90 features, so ‘g77’ no longer suffices.
PCRE has been updated to version 8.31, a bug-fix release.
The included version of ‘liblzma’ has been updated to version 5.0.4, a minor bug-fix release.
‘qgeom()’ could return ‘-1’ for extremely small ‘q’. (PR#14967.)
‘smooth.spline()’ used ‘DUP = FALSE’ which allowed its compiled C code to change the function: this was masked by the default byte-compilation. (PR#14965.)