[R-sig-Geo] error when using fit.variogram.gls

[Laura Poggio]

Dear all,
I was trying to use the function fit.variogram.gls from gstat package, and
I got the error below:
"Error in gamfn(h0, theta) : could not find function "gamfn""

Below some lines of code that trigger the error:
library(gstat)
library(sp)
data(meuse)
coordinates(meuse) = ~x+y
fit.variogram.gls(log(zinc)~1, meuse[1:40,], vgm(1, "Sph", 900,1))

My sessionInfo():
R version 3.4.2 (2017-09-28)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

Matrix products: default
BLAS/LAPACK: /usr/lib64/R/lib/libRblas.so

locale:
 [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_GB.UTF-8        LC_COLLATE=en_GB.UTF-8
 [5] LC_MONETARY=en_GB.UTF-8    LC_MESSAGES=en_GB.UTF-8
 [7] LC_PAPER=en_GB.UTF-8       LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] gstat_1.1-5 sp_1.2-5

loaded via a namespace (and not attached):
[1] zoo_1.8-0        compiler_3.4.2   tools_3.4.2      xts_0.10-0
[5] spacetime_1.2-1  grid_3.4.2       FNN_1.1          intervals_0.15.1
[9] lattice_0.20-35

The same is happening also under Fedora 27 (Workstation Edition).

Thank you in advance and best wishes

Laura

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