elements: fix enable-elements-abi=no build

diff --git a/src/psbt.c b/src/psbt.c
index 8e0ab3f..d098000 100644
--- a/src/psbt.c
+++ b/src/psbt.c
@@ -4552,10 +4552,13 @@ static int get_signing_data(const struct wally_psbt *psbt,
         if (utxo) {
             /* Add items to maps without allocating/copying */
             append_signing_data(scripts, i, utxo->script, utxo->script_len);
+#ifdef BUILD_ELEMENTS
             if (assets) {
                 append_signing_data(assets, i, utxo->asset, utxo->asset_len);
                 append_signing_data(values, i, utxo->value, utxo->value_len);
-            } else {
+            } else
+#endif
+            {
                 append_signing_data(values, i, (unsigned char*)&utxo->satoshi,
                                     sizeof(utxo->satoshi));
             }
@@ -4612,7 +4615,11 @@ int wally_psbt_get_input_signature_hash(struct wally_psbt *psbt, size_t index,
                 &scripts, assets_p, &values,
                 script, script_len,
                 0, WALLY_NO_CODESEPARATOR, NULL, 0,
+#ifdef BUILD_ELEMENTS
                 psbt->genesis_blockhash, sizeof(psbt->genesis_blockhash),
+#else
+                NULL, 0,
+#endif
                 sighash, sighash_type,
                 psbt->signing_cache, bytes_out, len);
 
diff --git a/src/tx_io.c b/src/tx_io.c
index edf19e1..77b4959 100644
--- a/src/tx_io.c
+++ b/src/tx_io.c
@@ -564,6 +564,9 @@ static void txio_hash_tapleaf_hash(cursor_io *io,
                                    bool is_elements)
 {
     const struct wally_map_item *item;
+#ifndef BUILD_ELEMENTS
+    (void)is_elements;
+#endif
     item = io->cache ? wally_map_get(io->cache, tapleaf_script, tapleaf_script_len) : NULL;
     if (item) {
         hash_bytes(&io->ctx, item->value, item->value_len);
@@ -594,6 +597,9 @@ static int legacy_signature_hash(
     const bool sh_none = (sighash & WALLY_SIGHASH_MASK) == WALLY_SIGHASH_NONE;
     const bool sh_single = (sighash & WALLY_SIGHASH_MASK) == WALLY_SIGHASH_SINGLE;
     cursor_io io;
+#ifndef BUILD_ELEMENTS
+    (void)is_elements;
+#endif
 
     /* Note that script can be empty, so we don't check it here */
     if (!tx || !values || BYTES_INVALID(script, script_len) ||
@@ -964,7 +970,6 @@ int wally_tx_get_input_signature_hash(
 {
     size_t is_elements = 0;
     uint32_t sighash_type = flags & WALLY_SIGTYPE_MASK;
-    int ret = WALLY_EINVAL;
 
     if (!tx || !tx->num_inputs || !tx->num_outputs || !values ||
         BYTES_INVALID(script, script_len) || key_version > 1 ||
@@ -974,11 +979,11 @@ int wally_tx_get_input_signature_hash(
         !flags || (flags & ~SIGTYPE_ALL) || !bytes_out || len != SHA256_LEN)
         return WALLY_EINVAL;
 
-    if ((ret = wally_tx_is_elements(tx, &is_elements)) != WALLY_OK)
-        return ret;
-#ifndef BUILD_ELEMENTS
-    if (is_elements)
+#ifdef BUILD_ELEMENTS
+    if (wally_tx_is_elements(tx, &is_elements) != WALLY_OK)
         return WALLY_EINVAL;
+#else
+    (void)is_elements;
 #endif
 
     switch (sighash) {