As suggested, I tried manual installation of the first dependency. Here is the resulting prompt :
R version 3.6.3 (2020-02-29) -- "Holding the Windsock"
Copyright (C) 2020 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin13.4.0 (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
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Type 'license()' or 'licence()' for distribution details.
Natural language support but running in an English locale
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Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
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install.packages("sp")
trying URL 'https://cran.rstudio.com/src/contrib/sp_1.4-2.tar.gz'
Content type 'application/x-gzip' length 1135318 bytes (1.1 MB)
==================================================
downloaded 1.1 MB
- installing source package ‘sp’ ...
** package ‘sp’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c Rcentroid.c -o Rcentroid.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c gcdist.c -o gcdist.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c init.c -o init.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c pip.c -o pip.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c pip2.c -o pip2.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c sp_xports.c -o sp_xports.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c surfaceArea.c -o surfaceArea.o
x86_64-apple-darwin13.4.0-clang -I"/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/include" -DNDEBUG -D_FORTIFY_SOURCE=2 -mmacosx-version-min=10.9 -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -I/Users/julesboulard/opt/anaconda3/envs/Renv/include -fPIC -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/julesboulard/opt/anaconda3/envs/Renv/include -fdebug-prefix-map=/usr/local/miniconda/conda-bld/r-base_1587480508710/work=/usr/local/src/conda/r-base-3.6.3 -fdebug-prefix-map=/Users/julesboulard/opt/anaconda3/envs/Renv=/usr/local/src/conda-prefix -c zerodist.c -o zerodist.o
x86_64-apple-darwin13.4.0-clang -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/lib -Wl,-dead_strip_dylibs -Wl,-rpath,/Users/julesboulard/opt/anaconda3/envs/Renv/lib -L/Users/julesboulard/opt/anaconda3/envs/Renv/lib -o sp.dylib Rcentroid.o gcdist.o init.o pip.o pip2.o sp_xports.o surfaceArea.o zerodist.o -L/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/lib -lR -Wl,-framework -Wl,CoreFoundation
ld: unknown option: -platform_version
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/share/make/shlib.mk:6: sp.dylib] Error 1
ERROR: compilation failed for package ‘sp’
- removing ‘/Users/julesboulard/opt/anaconda3/envs/Renv/lib/R/library/sp’
Warning in install.packages :
installation of package ‘sp’ had non-zero exit status