diff --git a/pkgs/by-name/ca/casacpp/Link-synthesis-target-with-LAPACK-BLAS-libraries.patch b/pkgs/by-name/ca/casacpp/Link-synthesis-target-with-LAPACK-BLAS-libraries.patch
new file mode 100644
index 000000000000..97e17f5bfc02
--- /dev/null
+++ b/pkgs/by-name/ca/casacpp/Link-synthesis-target-with-LAPACK-BLAS-libraries.patch
@@ -0,0 +1,28 @@
+From 71a658844e69e3993ab2fe712e0063a67daa00e0 Mon Sep 17 00:00:00 2001
+From: Moraxyc <i@qaq.li>
+Date: Wed, 20 May 2026 15:13:10 +0800
+Subject: Link synthesis target with LAPACK/BLAS libraries
+
+---
+ synthesis/CMakeLists.txt | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/synthesis/CMakeLists.txt b/synthesis/CMakeLists.txt
+index e2250f0..59b55dc 100644
+--- a/synthesis/CMakeLists.txt
++++ b/synthesis/CMakeLists.txt
+@@ -42,6 +42,11 @@ target_link_libraries(casacpp_synthesis PUBLIC PkgConfig::CASACORE)
+ # Libsakura dependency
+ target_link_libraries(casacpp_synthesis PUBLIC PkgConfig::SAKURA)
+ 
++# LAPACK / BLAS dependency
++find_package(BLAS REQUIRED)
++find_package(LAPACK REQUIRED)
++target_link_libraries(casacpp_synthesis PRIVATE LAPACK::LAPACK)
++
+ # Optional HPG dependency
+ if(DEFINED hpg_FOUND AND ${hpg_FOUND})
+ 	target_link_libraries(casacpp_synthesis PUBLIC hpg::hpg)
+-- 
+2.53.0
+
diff --git a/pkgs/by-name/ca/casacpp/package.nix b/pkgs/by-name/ca/casacpp/package.nix
index 6a701b79e35b..26495a1573e6 100644
--- a/pkgs/by-name/ca/casacpp/package.nix
+++ b/pkgs/by-name/ca/casacpp/package.nix
@@ -17,11 +17,13 @@
   protobuf,
   gsl,
   libxml2,
-  libxslt,
   fftw,
   fftwFloat,
-  sqlite,
+  blas,
+  lapack,
+  libxslt,
   openssl,
+  sqlite,
   mpi,
   mpiSupport ? false,
 }:
@@ -63,6 +65,10 @@ stdenv.mkDerivation (finalAttrs: {
     #   error: call to implicitly-deleted copy constructor of 'std::unique_ptr<vi::VisibilityIterator2>'
     #   error: object of type 'std::unique_ptr<vi::VisibilityIterator2>' cannot be assigned because its copy assignment operator is implicitly deleted
     ./Fix-Vi2DataProvider-move-semantics.patch
+
+    # fix missing LAPACK symbols
+    #   ld: symbol(s) not found, dgetrf_ dgetri_ dposv_ dpotri_
+    ./Link-synthesis-target-with-LAPACK-BLAS-libraries.patch
   ];
 
   postPatch = ''
@@ -88,9 +94,11 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optional mpiSupport mpi;
 
   buildInputs = [
+    blas
     libxslt
-    sqlite
     openssl
+    sqlite
+    lapack
   ];
 
   propagatedBuildInputs = [