diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 6753bb4..9cbfc77 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -51,7 +51,22 @@ jobs:
       - uses: r-lib/actions/check-r-package@v2
         with:
           upload-snapshots: true
-      - name: Test package loading
+      - name: Debug information
         run: |
-          Rscript -e "install.packages('bdrc', repos = NULL, type = 'source')"
+          pwd
+          ls -l
+          R -e "print(.libPaths())"
+      - name: Check package structure
+        run: |
+          ls -R
+      - name: Build package
+        run: |
+          R CMD build .
+      - name: Check built package
+        run: |
+          ls -l *.tar.gz
+      - name: Install and load package
+        run: |
+          PKG_FILE=$(ls -1t *.tar.gz | head -n 1)
+          R CMD INSTALL ${PKG_FILE}
           Rscript -e "library(bdrc); print(ls('package:bdrc'))"
diff --git a/src/Makevars b/src/Makevars
index 17a554a..ce93e5a 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1,5 +1,3 @@
 CXX_STD = CXX11
-PKG_CXXFLAGS = $(SHLIB_OPENMP_CXXFLAGS) -I/usr/local/Cellar/gcc/14.2.0/include
-PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) $(SHLIB_OPENMP_CXXFLAGS) -L/usr/local/Cellar/gcc/14.2.0/lib/gcc/current -lgfortran -lquadmath -lm
-
-FLIBS=-L/usr/local/Cellar/gcc/14.2.0/lib/gcc/current -lgfortran -lquadmath -lm
+PKG_CXXFLAGS = $(SHLIB_OPENMP_CXXFLAGS)
+PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) $(SHLIB_OPENMP_CXXFLAGS)
diff --git a/src/Makevars.win b/src/Makevars.win
index d715e49..4a28f0c 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,3 +1,4 @@
 CXX_STD = CXX11
 PKG_CXXFLAGS = $(SHLIB_OPENMP_CXXFLAGS)
 PKG_LIBS = $(SHLIB_OPENMP_CXXFLAGS) $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
+USE_CXX14 = yes