diff --git a/G/GIAC/build_tarballs.jl b/G/GIAC/build_tarballs.jl
index cc982646cf7..0a3a51ce4e8 100644
--- a/G/GIAC/build_tarballs.jl
+++ b/G/GIAC/build_tarballs.jl
@@ -7,13 +7,13 @@
 using BinaryBuilder, Pkg
 
 name = "GIAC"
-version = v"2.0.1"
+version = v"2.0.2"
 
 # Collection of sources required to build GIAC
 # Using the Meson-based fork from https://github.com/s-celles/giac
 sources = [
     GitSource("https://github.com/s-celles/giac.git",
-        "194ff510872c5b871e316bf5c7dfbe942273bef8"),  # dev branch
+        "64fdcefb45d0599e60083e785a3cc033e74714ee"),  # dev branch + GIAC_TYPE_ON_8BITS default
 ]
 
 # Bash recipe for building across all platforms
@@ -26,6 +26,49 @@ if [[ "${target}" == *freebsd* ]]; then
     GETTEXT_OPT="disabled"
 fi
 
+# Meson's dependency('blas')/dependency('lapack') want blas.pc/lapack.pc, but
+# OpenBLAS_jll only ships openblas.pc. Provide self-contained wrapper .pc
+# files (skip on macOS — Giac will detect the Accelerate framework instead).
+if [[ "${target}" != *apple-darwin* ]]; then
+    mkdir -p ${prefix}/lib/pkgconfig
+    cat > ${prefix}/lib/pkgconfig/blas.pc <<EOF
+prefix=${prefix}
+libdir=\${prefix}/lib
+includedir=\${prefix}/include
+
+Name: blas
+Description: BLAS interface provided by OpenBLAS
+Version: 0.3
+Libs: -L\${libdir} -lopenblas
+Cflags: -I\${includedir}
+EOF
+    cat > ${prefix}/lib/pkgconfig/lapack.pc <<EOF
+prefix=${prefix}
+libdir=\${prefix}/lib
+includedir=\${prefix}/include
+
+Name: lapack
+Description: LAPACK interface provided by OpenBLAS
+Version: 0.3
+Libs: -L\${libdir} -lopenblas
+Cflags: -I\${includedir}
+EOF
+fi
+
+# GLPK_jll ships no pkg-config file, so provide one.
+mkdir -p ${prefix}/lib/pkgconfig
+cat > ${prefix}/lib/pkgconfig/glpk.pc <<EOF
+prefix=${prefix}
+libdir=\${prefix}/lib
+includedir=\${prefix}/include
+
+Name: glpk
+Description: GNU Linear Programming Kit
+Version: 5.0
+Libs: -L\${libdir} -lglpk
+Cflags: -I\${includedir}
+EOF
+
 # Configure with Meson, disabling all optional dependencies
 meson setup build \
     --cross-file="${MESON_TARGET_TOOLCHAIN}" \
@@ -34,10 +77,10 @@ meson setup build \
     -Dpari=disabled \
     -Dntl=disabled \
     -Dcocoa=disabled \
-    -Dgsl=disabled \
-    -Dlapack=disabled \
+    -Dgsl=enabled \
+    -Dlapack=enabled \
     -Decm=disabled \
-    -Dglpk=disabled \
+    -Dglpk=enabled \
     -Dpng=disabled \
     -Dao=disabled \
     -Dsamplerate=disabled \
@@ -77,8 +120,15 @@ dependencies = [
     Dependency("GMP_jll"; compat="6.2.1"),
     Dependency("MPFR_jll"; compat="4.1.1"),
     Dependency("Readline_jll"; compat="8.2.13"),
+    Dependency("GSL_jll"; compat="2.8.1"),
+    # OpenBLAS32_jll = LP64 (32-bit integers, standard C ABI) — OpenBLAS_jll
+    # itself is ILP64 with _64_ symbol suffixes which Giac doesn't expect.
+    Dependency("OpenBLAS32_jll"),
+    Dependency("CompilerSupportLibraries_jll"),
+    Dependency("GLPK_jll"; compat="5.0.2"),
 ]
 
 # Build the tarballs, and possibly a `build.jl` as well.
+# preferred_gcc_version aligned with libgiac_julia_jll's recipe (Giac.jl#22).
 build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies;
-  clang_use_lld=false, preferred_gcc_version=v"8", julia_compat="1.10")
+  clang_use_lld=false, preferred_gcc_version=v"10", julia_compat="1.10")