Strange install bug on Mac OS Sequoia, R 4.5.1

[be-green]

This package is failing install with a very mysterious error message that I can't say I've seen before, looking for some insight.

Here's the error:

** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘farver’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/Users/bcg/Documents/Projects/warff/renv/library/macos/R-4.5/aarch64-apple-darwin24.4.0/00LOCK-farver/00new/farver/libs/farver.so':
  dlopen(/Users/bcg/Documents/Projects/warff/renv/library/macos/R-4.5/aarch64-apple-darwin24.4.0/00LOCK-farver/00new/farver/libs/farver.so, 0x0006): symbol not found in flat namespace '__ZNSt3__113__hash_memoryEPKvm'
Error: loading failed
Execution halted
ERROR: loading failed
* removing ‘/Users/bcg/Documents/Projects/warff/renv/library/macos/R-4.5/aarch64-apple-darwin24.4.0/farver’
Warning message:
In i.p(...) :
  installation of package ‘/var/folders/wh/wf4w1l_94qsdqz9_k3p2yl080000gq/T//RtmpoCbJ1E/file2a41742a018b/farver_2.1.2.9000.tar.gz’ had non-zero exit status

Session info:

R version 4.5.1 (2025-06-13)
Platform: aarch64-apple-darwin24.4.0
Running under: macOS Sequoia 15.6.1

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 
LAPACK: /opt/homebrew/Cellar/r/4.5.1/lib/R/lib/libRlapack.dylib;  LAPACK version 3.12.1

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: America/New_York
tzcode source: internal

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

loaded via a namespace (and not attached):
[1] compiler_4.5.1 tools_4.5.1 

Makevars:

LLVM = /opt/homebrew/opt/llvm

CC  = $(LLVM)/bin/clang
CXX = $(LLVM)/bin/clang++
CXX11 = $(LLVM)/bin/clang++
CXX14 = $(LLVM)/bin/clang++
CXX17 = $(LLVM)/bin/clang++ -std=gnu++17

CFLAGS += -O3 -fPIC
CXXFLAGS += -O3 -fPIC -fopenmp
LDFLAGS += -L$(LLVM)/lib -Wl,-rpath,$(LLVM)/lib
CPPFLAGS += -I$(LLVM)/include
SHLIB_OPENMP_CFLAGS = -fopenmp
SHLIB_OPENMP_CXXFLAGS = -fopenmp
SHLIB_OPENMP_LDFLAGS = -L$(LLVM)/lib -lomp

Any thoughts? Or other info you need?