I'm trying to install the svglite package in R-devel on my M3 Mac running Sonoma 14.7.1, and getting these results:

install.packages("svglite")
--- Please select a CRAN mirror for use in this session ---
trying URL 'https://cloud.r-project.org/src/contrib/svglite_2.2.1.tar.gz'
Content type 'application/x-gzip' length 134155 bytes (131 KB)
==================================================
downloaded 131 KB

* installing *source* package ‘svglite’ ...
** this is package ‘svglite’ version ‘2.2.1’
** package ‘svglite’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
using C++ compiler: ‘Apple clang version 16.0.0 (clang-1600.0.26.6)’
using SDK: ‘MacOSX15.2.sdk’
clang++ -std=gnu++17 -I"/Users/murdoch/R/R-devel/include" -DNDEBUG  
-I'/Users/murdoch/R/R-devel/library/cpp11/include' 
-I'/Users/murdoch/R/R-devel/library/systemfonts/include' 
-I'/Users/murdoch/R/R-devel/library/textshaping/include' -isystem /opt/R/arm64/include    
-fPIC  -g -O2   -c SvgStream.cpp -o SvgStream.o
clang++ -std=gnu++17 -I"/Users/murdoch/R/R-devel/include" -DNDEBUG  
-I'/Users/murdoch/R/R-devel/library/cpp11/include' 
-I'/Users/murdoch/R/R-devel/library/systemfonts/include' 
-I'/Users/murdoch/R/R-devel/library/textshaping/include' -isystem /opt/R/arm64/include    
-fPIC  -g -O2   -c cpp11.cpp -o cpp11.o
clang++ -std=gnu++17 -I"/Users/murdoch/R/R-devel/include" -DNDEBUG  
-I'/Users/murdoch/R/R-devel/library/cpp11/include' 
-I'/Users/murdoch/R/R-devel/library/systemfonts/include' 
-I'/Users/murdoch/R/R-devel/library/textshaping/include' -isystem /opt/R/arm64/include    
-fPIC  -g -O2   -c devSVG.cpp -o devSVG.o
clang++ -std=gnu++17 -dynamiclib -Wl,-headerpad_max_install_names -undefined 
dynamic_lookup -L/Users/murdoch/R/R-devel/lib -L/usr/local/lib -o svglite.so 
SvgStream.o cpp11.o devSVG.o -lpng -lz -L/Users/murdoch/R/R-devel/lib -lR
ld: library 'png' not found
clang++: error: linker command failed with exit code 1 (use -v to see 
invocation)
make: *** [svglite.so] Error 1
ERROR: compilation failed for package ‘svglite’
* removing ‘/Users/murdoch/R/R-devel/library/svglite’

I do have libpng installed:

murdoch@djmair4 /opt/R/arm64/lib
$ ls -l libpng*
lrwxr-xr-x  1 root  admin       10 30 Mar 18:58 libpng.a@ -> libpng16.a
lrwxr-xr-x  1 root  admin       11 30 Mar 18:58 libpng.la@ -> libpng16.la
-rw-r--r--  1 root  admin  1094008 30 Mar 18:58 libpng16.a
-rwxr-xr-x  1 root  admin      895 30 Mar 18:58 libpng16.la*

I have a config.site file in the R-devel-src folder, modified with these changes:

Index: config.site
===================================================================
--- config.site (revision 88220)
+++ config.site (working copy)
@@ -45,7 +45,7 @@
 ## It is also necessary to set the architecture here, e.g. 'gcc -m32'.
 ## If this is a wrapper it should pass on --version to the real compiler.
 ## This will be replaced by CC23 (see below) if a C23 compiler is found.
-## CC=
+CC=clang
## Debugging and optimization options for the C compiler.
 ## Use this to specify CFLAGS for the version of the C compiler
@@ -111,12 +111,12 @@
 ## options (such as defines) for the C preprocessor and compiler.
 ## If unset defaults to '-I/usr/local/include', with '-I/sw/include'
 ## prepended on systems using Fink with root '/sw'.
-## CPPFLAGS=
+CPPFLAGS='-isystem /opt/R/arm64/include'
## The command which runs the Fortran compiler.
 ## Used for both fixed-form and free-form Fortran
 ## If this is a wrapper it should pass on --version to the real compiler.
-## FC=
+FC="/opt/gfortran/bin/gfortran -mtune=native"
## Options for the Fortran compiler.
 ## Use this to specify comilation flags for fixed-form Fortran.
@@ -223,7 +223,7 @@
 ## and then looks under the names 'c++', 'g++', 'CC' and more OS-specific
 ## names (from autoconf).
 ## If this is a wrapper it should pass on --version to the real compiler.
-## CXX=
+CXX=clang++
## Options for the C++ compiler.
 ## CXXFLAGS=
@@ -255,7 +255,7 @@
## Objective-C(++), mainly for macOS
 ## On macOS, Apple clang with additional gcc flag -fobjc-exceptions
-## OBJC=
+OBJC=$CC
 ## OBJCFLAGS=
 ## OBJC_LIBS-
 ## Objective-C compiler, usually the same as $CXX $CXXSTD

Can anyone spot what needs fixing?

Duncan Murdoch

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